Journals Highlights

On the Cover
Nonlinear Talbot effect is a near-field nonlinear diffraction phenomenon in which the self-imaging of periodic object is formed by the second harmonic of the incident laser beam. Different from its conventional linear analogue, the periodic object here is made with spatially modulated second-order nonlinear coefficient of the medium, and the spatial resolution in Talbot self-imaging is improved by a factor of 2 thanks to frequency doubling. Consequently, the nonlinear Talbot effect is superior in applications that require high resolution imaging and processing, such as nonlinear optical microscopy, lithography, spectrometry, and material characterization.The nonlinear Talbot effect was first observed in periodically poled LiTaO3 crystals, which are also known as nonlinear photonic crystals. The self-imaging of 1D periodically and 2D hexagonally poled ferroelectric domain structures was observed by using the second harmonic generated in the crystals. Following this pioneering work, the dependence of nonlinear Talbot distance on parameters of nonlinear photonic crystals and the fractional nonlinear Talbot effects were also investigated. Despite of these recent achievements, the fundamental properties and capabilities of nonlinear Talbot effect have not been thoroughly studied so far. For instance, very useful characteristic of Talbot effect is its capability to produce defect-free images from imperfect structures, property known as self-healing. While such capability of image restoration has been well studied in linear Talbot effect, it has never been investigated in the regime of nonlinear optics.
Chinese Optics Letters
  • Jun. 23, 2021
  • Vol.19, Issue 6 (2021)
On the Cover
Topology is an important branch of mathematics formed in the 19th century. It studies the invariant properties of geometric figures or space under continuous deformation. The idea of topological physics originated from the exciting discovery of the integer quantum Hall effect (IQHE) in condensed-state physics. Klitzing found that the two-dimensional (2D) electron gas in a strong perpendicular magnetic field has a quantized Hall conductance. The quantization originates from the non-trivial topology of the energy band structure, which is characterized by the Chern number according to the theoretical work of Thouless, Kohmoto, Nightingale, and den Nijs (TKNN). Haldane and Raghu creatively introduced the concept of topology to photonic crystals for the first time, as they proposed a photonics analogue of the quantum Hall effect in photonic crystals. Edge states appear at the domain wall between materials that have different Chern numbers and go through the topological bandgap in momentum space according to the bulk-edge correspondence.
Chinese Optics Letters
  • Jun. 04, 2021
  • Vol.19, Issue 5 (2021)
On the Cover
The asymmetric transmission of electromagnetic waves refers to the difference in transmittance or polarization state when they pass through media from two opposite directions. This asymmetric transmission effect has potential applications in the integrated photonic system of optical communication, information processing and all-optical computing, and has been one of the important research topics. The traditional devices with asymmetric response are too bulky to meet the needs of the integration and miniaturization of modern optical devices. In recent years, much effort has been devoted to metasurfaces used to the design of asymmetric transmission devices. Due to its flat and ultra-thin features, metasurfaces have unique application prospects in miniaturized and integrated devices compared with traditional optical components.
Chinese Optics Letters
  • May. 07, 2021
  • Vol.19, Issue 4 (2021)
On the Cover
At present, the environmental problems such as resource depletion, water pollution and air pollution caused by the development of nature resources have are raised great social concerns. Among the environmental issues, lighting electricity accounts for about 20% of global electricity consumption. Compared with traditional lighting sources such as incandescent lamps and fluorescent lamps, white light emitting diodes (LEDs) have many outstanding advantages like high energy efficiency, long working life, environmental friendliness, and etc. Therefore, the development of LEDs lighting is an effective solution to save power and protect the global environment.
Chinese Optics Letters
  • May. 07, 2021
  • Vol.19, Issue 3 (2021)
On the Cover
The quest for developing novel imaging technologies to observe objects with high resolution is on-going. One of the straight-forward resolution enhancement technologies include illuminating objects with electromagnetic radiation with wavelengths shorter than that of the visible light which led to the development of electron, X-ray and ion microscopes, etc. An alternative method to improve the resolving power is to increase the numerical aperture of the imager. Both approaches have different types of technological demands; the former requires a compatible source, lens, and detector for a different electromagnetic spectral range, the later requires manufacturing of lenses with larger diameters or changes in optical configuration that still affect the modulation transfer function in a similar fashion. The above methodologies impose challenging loads on both the fabrication and materials engineering fronts. One of the easiest methods to improve the imaging resolution is to replace a coherent illumination with an incoherent one, which in turn doubles the spatial frequency limits of imaging. In addition to resolution enhancement, the above method also brings various advantages such as formation of images without speckles or edge ringing and at a substantially lower cost.
Chinese Optics Letters
  • Mar. 15, 2021
  • Vol.19, Issue 2 (2021)
On the Cover
Nanophotonic devices, which take photons as information carries, play key roles in next-generation photonic chip. The design of multifunctional and practical devices has always been one of the core topics of nanophotonic devices. However, traditional design methods rely on human experience and physical inspiration for structural design and parameter optimization, so they often consume a lot of computing resources to obtain excellent results, and the structure type is not abundant enough.
Chinese Optics Letters
  • Jan. 21, 2021
  • Vol.19, Issue 1 (2021)
On the Cover
Twelve years have passed since the emergence of stimulated Raman scattering (SRS) microscopy, which is now regarded as a powerful method of molecular-vibrational imaging. At that time, researchers were struggling to explore how we can utilize laser pulses to look into biological specimens. Indeed, multiphoton microscopy, third-harmonic generation (THG) microscopy, second-harmonic generation (SHG) microscopy, and coherent anti-Stokes Raman scattering (CARS) microscopy appeared in the 1990s and their applications were expanding in the 2000s.
Chinese Optics Letters
  • Dec. 28, 2020
  • Vol.18, Issue 12 (2020)
On the Cover
With the wide and expanding applications of laser in medical treatment, communication, industrial development, military and many other fields, existing laser wavelengths are inadequate to meet the growing needs of various applications. The development of new special laser wavelengths has attracted an increasing interest.
Chinese Optics Letters
  • Nov. 06, 2020
  • Vol.8, Issue 11 (2020)
On the Cover
A retro-reflector can create reflected wave that is always parallel to, but in the opposite direction of, the incoming wave. Previous retro-reflector can be classified into two types: one is bulk device, including corner-cube reflector, cats eyes reflector and Eaton lens, which cannot be integrated with planar modulators; the other is thin meta-surface retro-reflector, whose efficiency drops quickly as the viewing angle changes. To achieve planar thin retro-reflector with high efficiency and wide working angles, optical surface transformation (OST) can be used to design arbitrarily shaped retro-reflector.
Chinese Optics Letters
  • Oct. 10, 2020
  • Vol.18, Issue 10 (2020)
On the Cover
The quantum harmonic oscillator is an indispensable example for understanding the quantum classical correspondence, quantifying the concepts of radiation fields and quantum optics. The eigenmodes of two-dimensional (2D) quantum harmonic oscillators can be resolved into Hermite-Gaussian (HG) modes with rectangular symmetry or Laguerre-Gaussian (LG) modes with circular symmetry. Since the paraxial wave equation of the spherical laser cavity is the same as the Schrödinger equation of the two-dimensional harmonic oscillator, the HG and LG eigenmodes play important roles in the exploration of laser transverse modes. With the advent of end-pumped configurations, high-order HG and LG modes can be efficiently generated in diode-pumped solid-state lasers. The Ince-Gaussian (IG) mode is another eigenfunction form of the paraxial wave equation, which has recently been introduced, and it has also been experimentally observed in a stable cavity.
Chinese Optics Letters
  • Sep. 17, 2020
  • Vol.18, Issue 9 (2020)
On the Cover
The growing developments of optical technologies in energy, environmental, information, and biomedical applications are creating a demand for optical materials and devices which are not only sustainable but also implantable and bioresorbable. Within this context, naturally-derived biomaterials, such as silk, cellulose, chitin, melanin, and DNA, provide a unique opportunity by being simultaneously "technological" (e.g., optically active, micro- and nanoscale processable), "structural" (e.g., rich surface chemistry, mechanical flexibility), "sustainable" (e.g., renewable, eco-friendly), and "biological" (e.g., biocompatible, biodegradable) making them ideally suited for applications at the interface between optical technologies and environment within human or around human.
Chinese Optics Letters
  • Aug. 31, 2020
  • Vol.18, Issue 8 (2020)
On the Cover
Beam deflection is of fundamental importance in optical beam manipulation. It has potential applications in many fields, such as the LiDAR systems, advanced chips, free-space optical communication, and high-sensitivity sensing. Therefore, it is of great significance to achieve the large-angle and high-efficiency beam deflection for the design of the optical components.
Chinese Optics Letters
  • Jul. 20, 2020
  • Vol.18, Issue 7 (2020)
On the Cover
All-optical signal processing has attracted wide attention for its potential to overcome the extra loss induced by electrical-optical-electrical conversion. There are a variety of solutions for all-optical signal processing. For example, Kerr nonlinearity enables femtosecond-level signal processing which is far beyond the processing capability of current electronic devices. On the other hand, different from Kerr nonlinearity which typically requires high peak power, thermo-optic effect does not require high peak power and thus plays an important role for the all-optical devices whose states are needed to be hold for a long time, such as a router or a switch. Meanwhile recent development of nanomaterials has shown great values for their abundant photonic properties (e.g., saturable absorption, thermo-optic effect) and high flexibility to incorporate with different photonic platforms (e.g., fiber, integrated devices). Therefore applying nanomaterials to all-optical signal processing may open up a new world for functional photonic devices.
Chinese Optics Letters
  • Jul. 10, 2020
  • Vol.18, Issue 6 (2020)
On the Cover
Quantum walks, the counterpart of classical random walk, have essential differences between its classical one. There are many examples of classical random walks, such as Galton board and Brownian motion. In classical random walk, it is probability that superposed in the walk process, but it is amplitude in corresponding quantum walks. The probability distribution of walkers of these two kinds of walks is fundamentally different. In particular, the diffusion velocity of quantum walks is quadratic enhancement of spreading than classical random walks. In the contribution of these unique characters, quantum walks have been applied in quantum information process, quantum computation and other various areas.
Chinese Optics Letters
  • May. 21, 2020
  • Vol.18, Issue 5 (2020)
On the Cover
As the transmission capacity worldwide continues to grow exponentially and single-mode fiber-optic communication systems approach their capacity limit, space-division multiplexing (SDM) has attracted significant attention in recent years. By employing multiple spatial modes in few-mode fibers (FMFs) or multiple cores in multicore fibers, SDM provides a larger transmission capacity and enhanced signal processing ability compared with single mode fibers (SMFs).
Chinese Optics Letters
  • May. 06, 2020
  • Vol.18, Issue 4 (2020)
On the Cover
Since graphene was first exfoliated from graphite, it has been extensively used in diverse applications, including energy storage, single-molecule gas sensors, and photovoltaic cells owing to its unique and superior electrical, thermal, mechanical, optical, and magnetic properties. Three-dimensional (3D) porous graphene is a new type of carbon nano-material composing of two-dimensional (2D) graphene on a macroscopic scale. It not only inherits the excellent properties of graphene, but also has high specific surface area, high porosity, excellent compressibility, and an interconnected conductive network owing to its special 3D micro-nano structure. These properties make it attractive for applications such as flexible electronic equipment, thermal engineering, and catalysis loading.
Chinese Optics Letters
  • Apr. 02, 2020
  • Vol.18, Issue 3 (2020)
On the Cover
Two-dimensional (2D) materials usually refer to materials consisting of mono or a few layers of atoms, with thicknesses varying from one atomic layer to more than 10 nm. Various 2D materials have been successfully isolated, including graphene, hexagonal boron nitride (h-BN), transition metal dichalcogenides (TMDCs), black phosphorus (BP), and perovskite. 2D materials exhibit exotic physical and chemical properties such as atomic thickness, strong nonlinear optical properties, magnetic properties, and excellent mechanical strength that are different from their bulk counterparts, opening new opportunities for nanodevices, especially photonics applications.
Chinese Optics Letters
  • Mar. 25, 2020
  • Vol.18, Issue 2 (2020)
On the Cover
Silicon photonics is one of the most promising ways for optoelectronic integration, ensuring CMOS fabrication compatibility and multitudinous production of low-cost devices. Optical microring resonator is one of the most important silicon-based devices and has been extensively employed in a wide range of physical studies and applications due to the resonance enhancement property. Incorporating coupling control of a microring resonator is necessary in many scenarios, but modifications are essentially added to the resonator and impairs the capability of optical enhancement. The researchers from Peking University proposed a flexible coupling structure based on adiabatic elimination that allowed low-loss active coupling control without any modifications to the resonators.
Chinese Optics Letters
  • Mar. 19, 2020
  • Vol.18, Issue 1 (2020)
On the Cover
Localized surface plasmon polaritons are characteristic modes that arise from the resonant interaction of photons with the free-charge oscillations in metallic particles. Plasmonic resonances have attracted great attention as a means to localize and enhance optical fields over subwavelength regions. Such unique properties have fostered the advent of the field of nonlinear plasmonics, relying on plasmonic field enhancement to boost otherwise weak nonlinear effects. One open challenge in nonlinear plasmonics is the selective optical excitation of high-order resonances, as those would offer higher quality factors and field confinement compared with the readily accessible dipolar modes. In addressing such issue, researchers at the University of Kansas (KU) have explored an uncharted path in nonlinear plasmonics: the parametric excitation and amplification of localized surface plasmon polaritons. In the article "Parametric Resonances in Nonlinear Plasmonics" published in Chinese Optics Letters, Vol 17, Issue 12, 2019 (Shima Fardad, Eric Schweisberger, Alessandro Salandrino. Parametric resonances in nonlinear plasmonics [Invited][J]. Chinese Optics Letters, 2019, 17(12): 122402), the Authors review the physical principles of plasmonic parametric resonance (PPR) and discuss potential applications of PPR.
Chinese Optics Letters
  • Dec. 25, 2019
  • Vol.17, Issue 12 (2019)
On the Cover
The research group including Dr. Bing Sun from Nanjing University of Posts and Telecommunications (NUPT) demonstrated a tapered two-mode fiber (TTMF) to be operated at the dispersion turning point (DTP). Near the DTP, ultra-high sensitivities sensing was numerically obtained and then verified experiment was carried out. This work has been published in Chinese Optics Letters, Volume 17, No. 11, 2019.
Chinese Optics Letters
  • Nov. 19, 2019
  • Vol.17, Issue 11 (2019)
On the Cover
The research group led by Professor Lixiang Chen from Xiamen University and Dr. Li Zhang from Foshan University realized the frequency conversion from an infrared FP beam to a visible FP beam, based on vectorial second-harmonic generation with two cascading type-I phase-matching beta barium borate crystals of orthogonal optical axes. They visualized the structured features of vectorial SHG fields and revealed the interesting doubling effect of polarization topological index, i.e., a low-order FP beam was converted to a high-order one, while keeping the polarization singularities of C-points and L-lines both invariant. These results are reported in Chinese Optics Letters Vol. 17, No. 9, 2019 (Li Zhang, et al., Full vectorial feature of second-harmonic generation with full Poincaré beams).
Chinese Optics Letters
  • Oct. 11, 2019
  • Vol.17, Issue 9 (2019)
On the Cover
The research group led by Prof. Changshun Wang from Shanghai Jiao Tong University designs an all-optical logic sequence generator, which has one input port and four output ports, based on two different polarization holographic gratings. The logic signals of output ports depend entirely on the polarization of the input light signal. This work has been published in Chinese Optics Letters, Volume 17, Issue 8, 2019.
Chinese Optics Letters
  • Sep. 20, 2019
  • Vol.17, Issue 8 (2019)
On the Cover
The new type of all-optical logic gate taking advantage of lithium niobate material combined with micro-cavity structure was designed. The defect cavity is used to improve the extinction ratio of different logic output signals. The designed all-optical logic gate has a maximum extinction ratio of 23 dB. Then, according to the designed basic logic gate devices, the structure of all-optical half adder is designed, and the basic functions of logic operation are successfully realized. This work has been published in Chinese Optics Letters, Volume 17, Issue 7, 2019.
Chinese Optics Letters
  • Sep. 03, 2019
  • Vol.17, Issue 7 (2019)
On the Cover
The researchers from the group of Prof. Hong-Bo Sun (the Key Laboratory of Integrated Optoelectronics of Jilin University) demonstrated a three-dimensional microlens array with different curvature unit lenses (MLADC) based on bovine serum albumin (BSA) fabricated by femtosecond laser two-photon polymerization direct writing (FsDLW). The MLADC possesses unique and characteristic optical performance, as the curvatures of unit lenses are different along with their different positions, which will play a significant role in optimizing optical system structure and reducing optical elements, especially in field curvature correction. In addition, due to the unique advantages of FsDLW, such as non-contact and low thermal damage, the biological activity of the protein is partially retained. Therefore, it is easy to achieve a fine adjustment of the focal plane by utilizing the equilibrium swelling of the protein hydrogel in the solution. These results are reported in Chinese Optics Letters Vol. 17, No. 6 2019 (Zhishan Hou, et al., Tunable protein microlens array).
Chinese Optics Letters
  • Jul. 08, 2019
  • Vol.17, Issue 6 (2019)
On the Cover
Recently, topological charge, which can act as a measure of the angular momentum of vortex beams, has been established as a robust information carrier that is capable of being transmitted over numerous kilometers without any free-space path loss. It suggests that this technology is ready for operational deployment. However, as communication links are further extended to accommodate it, turbulence accumulated during propagation will result in the transmitted orbital angular momentum (OAM) signals becoming severely distorted, even under conditions of relatively weak turbulence. Apart from familiar turbulence effects such as beam wander, beam spreading and scintillation, it will also be important to take into account vortex splitting effects, which affect the precision of OAM signal reception. Vortex splitting refers to the topological charge of vortex beams breaking up where l >1 to give l individual single-charge vortices. These vortices cross the transverse plane quasi-independently. Generally, the larger the vortex splitting ratio, the smaller the average OAM value that can be measured.The research group led by Prof. Lixin Guo from Xidian University, propose a new method to mitigate vortex splitting in free-space optical communication by using the self-healing effect of auto-focusing Airy vortex beams (AAVB). The value of this work is that two common modes of coupling autofocusing Airy beams with vortices are unified by introducing a parameter that controls the AAVB intensity gradients. Through the action of self-healing effect, the energy of optic field flows inward radially, trapping the individual vortices. For this to be effective, the right intensity gradients need to be selected for different degrees of turbulence, thus improving the accuracy of OAM reception. The results of this work have been published in Chinese Optics Letters, Vol 17, Issue 4, 2019 (Xu Yan, et al. Free-space propagation of autofocusing Airy vortex beams with controllable intensity gradients).“This is a very valuable study that realizes the simultaneous modulation of beam trajectory and focus intensity without destroying the original AAVB structure, providing an effective new way of reducing vortex splitting” said Prof. Guo.For now, the research regarding vortex beam propagation is still focused on weak turbulence conditions. The realization of effective transmission and reception of OAM signals under conditions of strong turbulence and scattering media will be the focus of the group’s future work.Fig. 1. (a)-(d) Intensity distributions of AAVBs with l = 3 for different values of m = 0, 1.6, 3.0, and 5.0 after propagation through a turbulent optical channel. (e)-(h) Phase cross-sections of AAVBs corresponding to (a)-(d), respectively.
Chinese Optics Letters
  • Apr. 22, 2019
  • Vol.17, Issue 4 (2019)
On the Cover
With the rapid growth of the data traffic for hyper-scale internet data centre, the demand for high speed optical transceiver modules to interconnect among the intra and inter data centres beyond 100 Gbit/s becomes strong. Due to the limited space of the high port density line card data network center, the optical transceivers modules with small form factor are required to increase port density of line cards in communication systems. Considering the maturity of the process, the hybrid integration technology that assemble various discrete components in an ultra-compact tube is proposed to ensure the yield of the device.For packaging process of receiver optical subassembly (ROSA) modules, the microwave circuit usually contains two parts of a radio frequency circuit and a bias network on which many capacitors and resistors are mounted. If they are all installed in one circuit board, it will easily cause crosstalk and distortion of the electrical signals. To overcome this drawback, the research group led by Dr. Jianguo Liu from Institute of Semiconductors, Chinese Academy of Sciences, proposed a 3D microwave circuit which allows radio frequency (RF) signal and bias voltage to be isolated in physical space for compact packaging. The value of this work is the experimental three-dimensional assembly of the ultra-compact ROSA based on the high speed microwave modeling. The -3 dB bandwidths of four channels of the fabricated module are all up to 20 GHz and the frequency response results are in very good agreement between the modeling and the experimental measurements. The results will extend our knowledge on hybrid-integrated technology. This work entitled Ultra-compact four-lane hybrid-integrated ROSA based on three-dimensional microwave circuit design has been published in Chinese Optics Letters, Vol. 17, Issue 3, 2019.“The module used not only for 4×25 Gb/s non-return to zero (NRZ) modulation transmission, but also for many RF transmission systems such as remote antennas, satellite antennas, and secure encrypted communication. In addition, it can also be applied to radar systems to achieve full-band detection of radar”said Dr. Jianguo Liu from the research group.With the multi-faceted application of detectors in radio-over-fiber (ROF) systems and digital center systems, detector modules will move toward high power output, high signal-to-noise ratio, miniaturization, integration, and low power consumption. The further work will focus on the integration of detector chips with other functional chips, such as semiconductor optical amplifier (SOA) chips, trans-impedance amplifier (TIA) chips, and development of multi-function devices.The internal detailed configuration of the ROSA.
Chinese Optics Letters
  • Mar. 12, 2019
  • Vol.17, Issue 3 (2019)
On the Cover
High-precision measurement of absolute gravity is very important in Geophysics, Geodesy, Hydrology, Seismology, etc. It is difficult to evaluate the accuracy of an absolute gravimeter (AG) by itself, since the local absolute gravity value is always changing with time and position. Therefore, the comparison between different high-precision absolute gravimeters is of great importance for the evaluation of the instrument accuracy.Researchers from Zhejiang University of Technology and Zhejiang University reported their compact cold atom gravimeter (CCAG) for participating in the first Asia-Pacific Comparison of Absolute Gravimeters (APMP.M.G-K1), which was the first CCAG participating in a Regional Absolute Gravity Comparison in China. The principle of the CCAG is based on the matter wave interference. The test mass in the CCAG is the microcosmic atoms rather than the classic object, which makes the CCAG more suitable for the continuous gravity monitoring. The accuracy of this gravimeter was evaluated to be about 19 μGal after the correction of the main systematic errors. The sensitivity was estimated to be 90 without any vibration isolation system during measurement. This work has been published in Chinese Optics Letters, Volume 17, Issue 1, 2019 (Zhijie Fu, et al., Participation in the absolute gravity comparison with a compact cold atom gravimeter).Professor Qiang Lin, director of the group, believes that there are still spaces to improve the absolute accuracy of the CCAG. The successful participation and measurement of the CCAG in the APMP.M.G-K1 provides valuable experiences for the improvement of this kind of gravimeter.Based on the comparison results, further work will be focused on the improvement of accuracy and the suppression of systematic noises.A compact cold atom gravimeter participating in the Comparison of Absolute Gravimeters.
Chinese Optics Letters
  • Mar. 11, 2019
  • Vol.17, Issue 1 (2019)
Editors' Picks
With the rapid development of broadband centers, cloud-based services, the Internet of Things, and 5G services, network traffic is growing at a vigorous rate, which requires optical communication networks with higher capacity and lower power consumption. As the building block of optical communication networks, the function of the optical modulator is to realize the high-speed conversion of information from the electrical domain to the optical domain, and to convert data transmission from cable to ultra-low loss fiber. Lithium niobate (LiNbO3, LN) has been the dominant material platform for optical modulators widely used in optical fiber communications due to its excellent physical properties, such as its high electro-optic (EO) Pockels coefficient, low optical absorption, high intrinsic modulation bandwidth, and long-term material reliability. However, commercial LN modulators rely on titanium-diffused or proton-exchange waveguides. Such weakly confined optical waveguides are not beneficial to achieving strong electro-optic interaction. In the issue, such modulators have low modulation efficiency (~10V·cm) and large device sizes.
Chinese Optics Letters
  • Jun. 17, 2021
  • Vol.19, Issue 6 (2021)
Editors' Picks
Plasmonic color printing has several advantages over traditional color dyes printing: sub-wavelength resolution, the production of bright and non-fading colors. In general, the reflected color from metallic structures is determined by the plasmonic resonance, which is highly sensitive to the structure geometry and optical constants. Tuning the geometries and size of the plasmonic nanostructures is a means to tailoring absorption spectra in the visible frequency range.
Chinese Optics Letters
  • Jun. 03, 2021
  • Vol.19, Issue 5 (2021)
Editors' Picks
Textile dyeing plays an indispensable role in our daily life, enriching peoples choices of the textile and satisfying our desire for aesthetics. In general, traditional textile dyeing is mainly based on chemical pigments. However, the old-fashioned technique may lead to environmental pollution and health concerns. Fortunately, structural colors found in the natural world inspire people to utilize nanostructures to achieve coloration meanwhile avoid the abovementioned problems. Structural colors originate from the interaction of light with photonic structures whose feature sizes are comparable to visible wavelengths. These interactions include interference, diffraction, scattering, or their combination.
Chinese Optics Letters
  • May. 27, 2021
  • Vol.19, Issue 5 (2021)
Editors' Picks
Emerging from the strong-field driven solids, high-harmonic generation (HHG) has become a frontier of ultrafast electron dynamics and attosecond physics in condense matter. High-harmonic spectroscopy provides an opportunity to steer ultrafast electron dynamics in subcycle timescale and a promising route to produce coherent light pulses in extreme ultraviolet region with enhanced yield. Because of the complexity of solid materials, HHG shows a variety of new phenomena and corresponding mechanisms. Especially, even-order harmonics are generated by breaking the inversion symmetry of a system. In spite of the widely adopted theoretical models in length gauge, velocity gauge preserves the translational symmetry of the crystal structure and decouples electron dynamics of different crystal momentum, which can be advantageous in interpreting the even-order harmonics generation.
Chinese Optics Letters
  • May. 26, 2021
  • Vol.19, Issue 4 (2021)
Editors' Picks
In the development of topological photonics, robust propagation behaviors of topologically protected states in photonic analog of topological insulators have attracted broad attention. In the presence of dynamic time-dependent drivings, much more interesting topological phenomena are expected. Specifically, when the driving field is time-periodic, dynamic analogs of topological insulators, Floquet topological insulators FTIs, have been theoretically proposed in various dimensions. On the experimental side, researchers have already designed FTIs in cold atoms, photonic crystals and other systems. However, clear demonstrations of dynamic behaviors of FTIs have been rare, especially in one-dimensional systems, due to the lack of a flexible platform with easily tunable frequency and amplitude of the periodic driving field.
Chinese Optics Letters
  • Apr. 15, 2021
  • Vol.19, Issue 4 (2021)
Editors' Picks
Thermal nanoimprint lithography, or nanoimprinting in short, is the process by which nano- and microscopic structures are transferred onto a material by heating it up to a specific temperature, such that it becomes malleable and can be molded into a desired shape. The technique has proven particularly useful for chalcogenide glasses due their low glass transition temperatures (e.g. 185 ºC), that allow for structuring of the glasses at temperatures that are easily obtained by conventional heaters. For this reason, thermal nanoimprinting has been applied in the fabrication of various photonic devices, including planar waveguides, diffraction gratings, and ring resonators.
Chinese Optics Letters
  • Apr. 02, 2021
  • Vol.19, Issue 3 (2021)
Editors' Picks
The ultra-short laser sources, especially in ultraviolet (UV) region, are widely used for many different kinds of applications such as microfabrication, ultrafast spectroscopy, quantum optics, scientific research and so on. The UV pulses with high single-photon energy allows rapid absorption and a small focal spot, potentially enabling high machining accuracy and patterning ability even in wide bandgap materials.
Chinese Optics Letters
  • Mar. 08, 2021
  • Vol.19, Issue 3 (2021)
Editors' Picks
In recent years, ultrafast pulsed lasers have attracted great attention because of the superior performance of the narrow pulse width, fast response time, and high peak powers. Particularly, mode-locked lasers with high repetition rates, such as gigahertz (GHz) lasers, have been widely used in a number of photonic systems such as high-speed communication, biological imaging, and nonlinear microscope.
Chinese Optics Letters
  • Feb. 25, 2021
  • Vol.9, Issue 2 (2021)
Editors' Picks
When light is reflected by a mirror, the tangential components of the momentum of incident light and reflected light are the same. On the contrary, a retroreflector flips the direction of incident light, and the light will be reflected back along the incident direction. This characteristic means that the reflected light from the retroreflector can be collected at the same position from where it is emitted.
Chinese Optics Letters
  • Feb. 24, 2021
  • Vol.19, Issue 2 (2021)
Editors' Picks
Terahertz (THz) waves are electromagnetics waves with a frequency range from 0.1 THz to 10 THz. Particularly, THz waves exhibit distinguished physical properties, such as anti-interference, narrow beam and high bandwidth, granting themselves great potentials for applications in wireless high-speed communications, reliable communications, and secure communications. Furthermore, the THz spectrum band is the key to the development of 6G mobile communication networks that require the wireless data transmission speed to exceed TB per second. Fortunately, the THz spectrum band provides a higher usable bandwidth, and hence meets the ever-increasing demand for higher data transmission rate. Due to the high absorption rate of the water vapor to THz waves, the propagation of THz waves in the atmosphere attenuates drastically with the increase of distance, which is conducive to the achievement of secure communication in space.
Chinese Optics Letters
  • Feb. 05, 2021
  • Vol.19, Issue 1 (2021)
Editors' Picks
Airy beam, an optical corresponding form of diffraction-free wavepacket solutions of Schrödinger equation, have been found in varieties of optical applications, such as optical trapping, self-bending plasma channels, light bullet generation, light sheet microscopy, and precision machining due to its peculiar properties, e.g., non-diffraction, lateral acceleration, self-bending, and self-healing.
Chinese Optics Letters
  • Feb. 03, 2021
  • Vol.19, Issue 1 (2021)
Editors' Picks
In quantum mechanics, it is not easy to answer the question where a photon has been. On the one hand, If we try to measure the accurate "position" of a photon, then the interaction between the photon and the measurement devices will generally be strong enough to destroy the quantum state of the photon (e.g., the photon is absorbed by a photon detector.), and the propagation of the photon will be blocked. On the other hand, if the interaction between the photon and the measurement devices is too weak to destroy the quantum state of the photon, the accurate "position" of the photon could not be measured.
Chinese Optics Letters
  • Jan. 18, 2021
  • Vol.19, Issue 1 (2021)
Editors' Picks
High repetition rate ultrashort pulse lasers have been attracting much interest as a tool for local melting, leading to elemental technologies for micro-welding of transparent materials such as a glass substrate.
Chinese Optics Letters
  • Dec. 24, 2020
  • Vol.18, Issue 12 (2020)
Editors' Picks
Chirped pulse amplification (CPA)technique has been awarded Nobel prize in Physics in 2018.There are rich literatures to explain this technique to public, most from the view of laser physics, that CPA is a powerful tool, using a pair of high-density gratings, to amplify laser pulses to the most powerful laser pulses in the past decades.
Chinese Optics Letters
  • Nov. 23, 2020
  • Vol.18, Issue 11 (2020)
Editors' Picks
Random numbers are important resources in science, engineering and even economics. Methods based on some deterministic algorithm and some randomness seed in most computers, can produce numbers with random statistic distribution, but be possibly predicted in principle, which is called pseudorandom number generator. However, the true random numbers can be generated from unpredictable physical events, guaranteed by the intrinsic randomness of some physical processes.
Chinese Optics Letters
  • Oct. 28, 2020
  • Vol.18, Issue 10 (2020)
Editors' Picks
Photons are excellent information carrier for high-speed and large-capacity information processing as they can be transmitted over a long distance with very low loss and without any known decoherence mechanism in free space. As one of fundamental particles, photons have wave-particle duality demonstrated in double-slit experiment. In this experiment, each photon interferes only with itself due to the quantum uncertainty of which path through the optical apparatus it takes, which associates to a particle-like behavior. The interference pattern, which is the accumulated sum of many single photon interference events, accords to a wave-like behavior.
Chinese Optics Letters
  • Oct. 19, 2020
  • Vol.18, Issue 10 (2020)
Editors' Picks
Terahertz (THz) waves are electromagnetic waves between microwaves and infrared light, possessing a frequency range from 0.1 THz to 10 THz. Particularly, THz waves share the characteristics of both microwave and light waves, and exhibit distinguished physical properties, such as low quantum energy, strong penetrability and large bandwidth, granting themselves great potentials for applications in wireless transmission of large-capacity data. Furthermore, the THz spectrum band is the key to the development of 6G mobile communication networks that require the wireless data transmitting speed to exceed TB per second. Fortunately, the THz spectrum band provides a higher usable bandwidth, and hence meets the ever-increasing demand for higher data transmission rates. Due to the high absorption rate of the water vapor to THz waves, the propagation of THz waves in the atmosphere attenuates drastically with distance, which is conducive to the achievement of secure communication in space. On the other hand, the THz technology also has broad application prospects infields of biomedicine, environmental science, material science, public security, and national defense and military. Therefore, the researching of THz components with a large modulation range and a fast operation speed is of great significance to promote the development of THz technology. At present, due to the lack of widespread practical applications in the range of THe frequency, the THz band is also called "THz gap". It is currently very difficult to obtain active and efficient active-control THz devices, which hinders the advancement and applications of the THz technology.
Chinese Optics Letters
  • Oct. 10, 2020
  • Vol.18, Issue 9 (2020)
Editors' Picks
Deceptive jamming is one of the important electronic interference methods in modern warfare. By producing false or misleading target echoes, the radar will obtain false target information and make wrong judgments. In order to resist the deceptive jamming, radar receivers need to distinguish the real and false targets by measuring the parameters of the received signals, like frequency. Unfortunately, the electronic jamming equipment, empowered by the current digital radio frequency memory (DRFM) technology, is capable to produce false signals with the same carrier frequency of the real target echoes. As a result, it is difficult to identify real and false targets by simply monitoring the frequency.
Chinese Optics Letters
  • Sep. 24, 2020
  • Vol.18, Issue 9 (2020)
Editors' Picks
Atomic gravimetry measures the gravitational acceleration through matter-wave interferometry. As this novel quantum system suffers neither mechanical wear nor drift, it outperforms or strongly enhances the classical devices, such as the falling-corner-cube or spring-mass systems, in gravity survey. Since the very first demonstration in laboratory over 30 years ago, atomic gravimetry has matured to a versatile tool that offers both precise and accurate absolute gravity measurement to fundamental research and metrology, such as testing the weak equivalence principle or linking the mass and weight of the test mass in Kibble balance. In the light of current rapid development of compact cold-atom gravimeters, enormous effort has been made to push atomic gravimetry out of the laboratory to fulfill the demands of geophysics and civil engineering in noisy urban environments, where the vibration noise limits the measurement sensitivity and precision.
Chinese Optics Letters
  • Sep. 18, 2020
  • Vol.18, Issue 9 (2020)
Editors' Picks
Optical nonlinear effects such as nonlinear refraction, multi-photon absorption and saturation absorption have been widely exploited in applications of fluorescence spectroscopy, optical pulse metrology, pulse shaping, mode-locked lasers, optical limiting, and all-optical switches. The characterization of nonlinear optical coefficients is a very important task for the evaluation and selection of suitable optical materials.
Chinese Optics Letters
  • Jul. 21, 2020
  • Vol.18, Issue 7 (2020)
Editors' Picks
Chinese Optics Letters
  • Jul. 08, 2019
  • Vol.17, Issue 7 (2019)
Editors' Picks
Chinese Optics Letters
  • Jul. 08, 2019
  • Vol.17, Issue 7 (2019)
COL Highlights
Organic and inorganic halide perovskites have attracted a lot of attention due to their extensive use in various optoelectronic applications given their unique properties like broad band wavelength absorption, high photoluminance (PL), narrow full width at half-maximum (FWHM), band gap tunability, and intrinsic photophysical stability. Perovskite material is widely applied in light- emitting diodes (LEDs), lasers, and photodetectors. Particularly, perovskite LED (Pe-LED) has been studied, and its efficiency has been significantly improved by enhancing the crystallinity and morphology of perovskite film. Despite the advantages of the fast free exciton emission attenuation described above, it may help transfer non-radiant energy to trapped states.
Chinese Optics Letters
  • Mar. 22, 2021
  • Vol.19, Issue 3 (2021)
COL Highlights
Up-conversion luminescence (UCL) materials doped with rare earth (RE) ions have deserved soaring attention in the past decades because of their excellent properties and potential applications in color displays, temperature sensor devices, drug delivery, photovoltaic, cell imaging and tumor therapy.
Chinese Optics Letters
  • Mar. 19, 2021
  • Vol.19, Issue 2 (2021)
COL Highlights
Most optical instruments, including a simple lens or sophisticated camera lenses, have various types of aberrations. Nevertheless, there do exist optical instruments that are free of aberrations and can provide sharp (stigmatic) images of all points in certain two-dimensional (2D) or three dimensional (3D) of space within geometrical optics. Such devices are called absolute instruments and have wide applications in cloaks, super-resolution and sub-wavelength focusing. Traditional examples of absolute instruments include Maxwells fish-eye, Eaton, Luneburg and invisible sphere lenses and their refractive index profile are all radius dependence in 2D or 3D space. In addition, there are more intrinsic physical properties in one dimensional (1D) absolute instrument family. For instance, the well-known symmetric self-imaging Mikaelian lens can be mapped from the Maxwells fish-eye lens by an exponential conformal mapping w=exp(z). Compared with cylindrical or spherical symmetry Maxwell fish-eye lens, the 1D Mikaelain lens is simpler and more intuitive both in theoretical analysis and experimental fabrication. And the physical images can also be easily extended to 2D or 3D by conformal mappings, even non-symmetric cases. Now there comes a question: Besides the Maxwells fish-eye lens, whether the common Eaton and Luneburg lenses have such powerful 1D conformal lenses like Mikaelain lens?
Chinese Optics Letters
  • Jun. 29, 2020
  • Vol.8, Issue 6 (2020)
COL Highlights
As one of the most important optical resonators, the photonic crystal cavity has a variety of advantages to resonantly control light-matter interactions and light wave propagations. First, the photonic crystal cavity is well recognized as one of the optical cavities with the highest Q/Vmode factor, where Q and Vmode are quality factor and mode volume of the resonant mode, respectively. The density of electric field of a resonant mode is proportional to the Q/Vmode factor, which therefore enables the photonic crystal cavitie as a promising platform to control light-matter interactions for highly efficient nonlinear optics, optomechanics, classical and quantum light emissions. Second, photonic crystal cavities are normally fabricated in dielectric slabs, including silicon, silicon nitride, III-V groups, and lithium niobate. Their planar structures make them easy to construct ultracompact photonic integrated circuits with the combination of other defect structures in the planar photonic crystal (PPC), such as PPC waveguides. The planar structure also allows their integration with electrical circuits for optoelectronic devices. Third, compared with other optical cavities, these PPC cavities could be straightforwardly fabricated using the standard technologies of semiconductor electronic devices, facilitating their practical applications.
Chinese Optics Letters
  • Jun. 24, 2020
  • Vol.18, Issue 6 (2020)
COL Highlights
Although light-emitting diodes (LEDs) and laser diodes (LDs) have been widely used for peoples daily life and scientific fields, e.g. fiber communication and optical interconnection, medical application, industrial measurement and military. nowadays, scientists in the world still have been undertaking the research on seeking for better lightening material structure and disclosing their characteristics by theory and experiment to further enhance these semiconductors light-emitting device performance.
Chinese Optics Letters
  • Jun. 09, 2020
  • Vol.18, Issue 5 (2020)
COL Highlights
Polarization-induced penalties such as polarization mode dispersion (PMD) and polarization dependent loss/gain (PDL/PDG), are crucial obstacles to fully realize the ultrahigh speed long-haul fiber-optic network, as well as guarantee the reliability of quantum keys distributing in optical-fiber-based quantum communication system. To mitigate those penalties, the state of polarization (SOP) must be controlled effectively. Up to now, there are many approaches to manipulate the SOP such as fiber bending or squeezing, Faraday rotation, fiber nonlinear effect, magnetic field modulated D-shaped fiber, and electro-optic effect in LiNbO3 waveguide. Among them, the piezoelectric polarization controllers (PPCs) based on fiber squeezing, are more practical and widely used because of their low power penalty, which are particularly suitable for optical fiber backbone system.
Chinese Optics Letters
  • Jun. 09, 2020
  • Vol.18, Issue 5 (2020)
COL Highlights
Polarization-induced penalties such as polarization mode dispersion (PMD) and polarization dependent loss/gain (PDL/PDG), are crucial obstacles to fully realize the ultrahigh speed long-haul fiber-optic network, as well as guarantee the reliability of quantum keys distributing in optical-fiber-based quantum communication system. To mitigate those penalties, the state of polarization (SOP) must be controlled effectively. Up to now, there are many approaches to manipulate the SOP such as fiber bending or squeezing, Faraday rotation, fiber nonlinear effect, magnetic field modulated D-shaped fiber, and electro-optic effect in LiNbO3 waveguide. Among them, the piezoelectric polarization controllers (PPCs) based on fiber squeezing, are more practical and widely used because of their low power penalty, which are particularly suitable for optical fiber backbone system.
Chinese Optics Letters
  • Jun. 04, 2020
  • Vol.18, Issue 5 (2020)
COL Highlights
Seeing through scattering media is highly desired in many occasions, such as remote sensing through clouds, fog and haze, underwater detection, anti-terrorism surveillance, biological tissue imaging and clinical diagnosis. The speckle patterns formed by signal lights passing through the scattering medium are difficult to distinguish. In fact, the information is only disturbed but not lost. However, multiple scattering experienced by photons when propagating in scattering media breaks the point-to-point correspondence required by traditional imaging methods, requiring some new imaging methods to overcome this problem.
Chinese Optics Letters
  • May. 07, 2020
  • Vol.18, Issue 4 (2020)
COL Highlights
Mid-infrared ultrafast laser has been generally produced from optical parametric oscillator or amplifier, which requires a powerful pump source and precise time synchronization. Mode-locked fluoride fiber laser is a new way to generate mid-infrared ultrafast laser, which possesses the advantages of compactness, robustness, and low cost, and is considered as a promising substitute for optical parametric oscillator or amplifier. Pulse duration is a key parameter for ultrafast laser. Mid-infrared pulses with femtosecond duration are desired for many applications such as supercontinuum generation, pump-probe measurement, and soliton self-frequency shift. The pulse duration of Er:ZBLAN fiber mode-locked laser reported so far is beyond 200 fs limited by water molecule absorption. S. Antipov et al adoped Ho:ZBLAN fiber with an operation wavelength of 2.9 μm to reduce the water molecule absorption, however, the pulse duration was only decreased to 180 fs.
Chinese Optics Letters
  • Apr. 16, 2020
  • Vol.18, Issue 3 (2020)
COL Highlights
Coherent light detection and ranging (Lidar) is an effective tool for remote sensing detection of atmospheric information. For example, coherent wind measurement Lidar can detect three-dimensional wind field information, and differential absorption Lidar can be used for remote sensing of the greenhouse gas. In recent years, 1645 nm high-energy single-frequency pulsed lasers have been widely used in coherent Lidar detection systems. The wavelength at 1645 nm belongs to the eye-safe range, locates in the atmospheric window with high atmospheric transmittance, and covers the absorption peak of methane, which could be used for differential absorption detection of methane gas concentration. At the same time, this wavelength locates in the communication band, so the corresponding devices such as detectors are relatively mature. This makes lasers at wavelength of 1645 nm are widely used as light sources for Lidars.
Chinese Optics Letters
  • Apr. 15, 2020
  • Vol.18, Issue 3 (2020)
COL Highlights
Due to the multitudinous properties such as instance, ferroelectricity, dielectricity, piezoelectricity, and pyroelectricity, ferroelectric functional material has become a research hotspot among all the innovative materials since it has been discovered in the last century. And in optics field, as owning outstanding electrooptic effect, acousto-optic effect, photorefractive effect and non-linear optics, ferroelectric functional material has been applied as the key component in optical waveguide, optical switch, acousto-optic modulation device, optical information storage device for second harmonic generation, optical parametric oscillation etc. Moreover, it has been utilized in thin film memory, high capacity capacitors, tunable microwave devices, positive temperature coefficient thermistors, piezoelectric transducers, piezoelectric and pyroelectric sensors, infrared sensors and imagers, display devices, etc.
Chinese Optics Letters
  • Mar. 30, 2020
  • Vol.18, Issue 2 (2020)
COL Highlights
Tunneling is one of the fundamental topics of quantum mechanics. Although the issue of tunneling has already been discussed in detail in text books, the consensus on whether tunneling of a particle through a barrier takes a finite time has not been achieved so far. The resolution of this problem is paramount to fully comprehend the tunneling process itself. Attoclock is an intriguing experimental procedure with temporal resolution in the scale of attoseconds to measure the tunneling delay. Specifically, for atoms subject to the elliptically polarized (EP) laser field, the instant when the electron appears in the continuum is mapped to the final angle of the momentum vector in the polarization plane, which can be measured experimentally. As well accepted, the most crucial advantage of the attoclock scheme is that, to achieve temporal resolution in the scale of attoseconds, the attosecond pulse is not necessary any longer, which lowers the technical demand to a great extent and makes this experimental procedure attractive.
Chinese Optics Letters
  • Mar. 19, 2020
  • Vol.18, Issue 1 (2020)
COL Highlights
Owing to strong confinement of light in ultra-small mode volume, whispering gallery mode (WGM) microresonators have attracted great interest. In previous years, different whispering gallery mode geometries have been investigated such as rings, disks, cylinders, spheres, toroids, polygons and microbottles but due to absence of mode suppression techniques, microlaser produced through these geometries is multimode. Multimode occurrence can be troublesome in distinguishing selective modes for sensing application. So, realization of single mode laser is an essential requirement for sensing and spectroscopy applications. Single WGM lasing can be obtained by decreasing the size of microresonators, coupled cavities in which one cavity serves as a spectral filter to the other one by using the Vernier effect, parity-time symmetry effect and piezoelectric effect.
Chinese Optics Letters
  • Dec. 25, 2019
  • Vol.17, Issue 12 (2019)
News
Chinese Optics Letters (COL) invites original articles for a Special Issue on Lithium Niobate Based Photonic Devices to be published in June 25 2021. Lithium niobate (LiNbO3) is a multifunctional crystal with combination of a number of excellent properties, such as electrooptical, acousto-optic, nonlinear optical, piezoelectric, and pyroelectric features. In optics and photonics, the LiNbO3-based devices have been widely applied in various aspects. Typical applications include acoustic- and electro-optic modulators, nonlinear wavelength converters, waveguide amplifiers, and quantum memories. The traditional LiNbO3 based photonic devices are constructed on micro-photonic structures, e.g., optical waveguides. A number of techniques have been utilized to produce low-loss LiNbO3 waveguides towards diverse applications. Recently, thin-film devices based on LiNbO3-On-Insulators (LNOI) technology have emerged as promising candidates due to the on-chip integration and strong confinement of light fields. Exciting LNOI-based devices, such as high speed modulators, highly efficient nonlinear optical elements, or hybrid quantum chips, have been developed through advanced techniques, showing distinguished performance for practical applications. There are continuous interests amid researchers on LiNbO3-based photonic devices and related applications, and a number of research groups are devoted to these interesting works. Regarding to these efforts and achievements, the scope of this special focus, covers all aspects of recent theoretical and experimental research related to LiNbO3–based photonic structures and devices. Specific areas of interest include, but not limited to:
Chinese Optics Letters
  • Oct. 14, 2020
  • Vol.19, Issue 6 (2020)
News
Chinese Optics Letters (COL) invites original articles for a Special Issue on Metal Halide Perovskite and Their Applications to be published in March 2021. Within the last ten years, metal halide perovskites have excited the photovoltaic research community owing to their superior optical and electrical properties, ease of fabrication, low processing cost, and ease of bandgap tuning. In addition, they also hold great promise for optoelectronic and photonic applications, such as light-emitting diodes, photodetectors and lasers. Although a significant amount of research on metal halide perovskites has been conducted during the last few years, plenty of challenges to be addressed and opportunities to bring laboratory research to real-world devices lie ahead of researchers. For instance, 1) advance synthetic methodology with controllable compositions, dimensionality, morphologies and orientations; 2) establish and advance technology and instrumentation to study fundamental structural-properties as well as the light-matter interactions inside; and 3) develop integrated optoelectronic and photonic devices based on perovskites and to feed this knowledge back into the virtuous cycle of design, synthesis, measurement and application. In these regards, the scope of this special focus, covers all aspects of recent theoretical and experimental research related to metal halide perovskites.
Chinese Optics Letters
  • Feb. 21, 2020
  • Vol.19, Issue 3 (2021)
News
Chinese Optics Letters (COL) invites original articles for a Special Issue on Soft-matter Photonics (Soft Mattonics) to be published in August 2020. Photonics is an emerging and important area that has attracted widespread attention in recent years. Compared with solid materials, soft matters have inherent advantages such as excellent adjustability, high flexibility, scalable size, ease of manufacture, and environmental adaptation. The various interesting properties of soft matter are not only worthy of basic research, but also inspires fantastic applications, especially in photonics. Therefore, this topic focuses on researches about liquid crystal and soft matter photonics. This special issue aims to attract research on soft matter photonics (Soft Mattonics) and promote the development of related applications. All papers on soft matter photonics are encouraged to be submitted to this issue, including the preparation of soft materials for photonic applications, the discussion of the mechanism of soft matter photonics, and the demonstration of photonic elements and devices based on soft matters.
Chinese Optics Letters
  • Feb. 06, 2020
  • Vol.18, Issue 8 (2020)
News
Submission Deadline: July 15, 2019Chinese Optics Letters (COL) invites original manuscript submissions for a Special Issue on Underwater Wireless Optical Communication to be published in October 2019. The oceans, where life itself arose from, are a critical player in the basic elements indispensable for human life, like climate, weather, nourishment, and mineral resources, to name a few. For this reason, ocean exploration owns scientific, strategic and economic significance and has been attracting global attention. Foreseeing the rapid development of underwater exploration, a high-speed underwater wireless communication system becomes indispensable. Recently, underwater wireless optical communication (UWOC) has gained a renewed interest from both academic and industrial communities, because of its high bandwidth, compact antennas, low latency, cost-effectiveness and low power consumption. We envision many situations where the wireless optical links can be complementary to or even more competitive than its acoustic counterpart, such as broadband communications between various underwater vehicles and underwater sensors. By leveraging the low-absorption window of seawater in the blue-green band, optical signals can transmit several tens or hundreds of meters in general waters. In addition, an underwater optical wireless communication network can be implemented based on these optical links, to further enhance the transmission range, flexibility and robustness by virtue of multiple hops, and reliable network operation. The UWOC paves a new way to construct next-generation high-performance underwater wireless links in the immediate future. The scope of this special issue covers all aspects of theoretical and experimental research related to UWOC. Specific areas of interest in UWOC include, but not limited to:- Transmitter and receiver device, module and systems- LED and laser based underwater optical links- Channel characterization and modeling- Narrow beam line-of-sight optical communications- Non-line-of-sight communication links- Self-powered underwater optical communication systems- Networking and security issues- Signal processing, etc. Guest Editors:Prof. Jing Xu, Zhejiang UniversityEmail: jxu-optics@zju.edu.cnProf. Boon S. Ooi, King Abdullah University of Science & TechnologyEmail: boon.ooi@kaust.edu.saProf. Gong-Ru Lin, Taiwan UniversityEmail: grlin@ntu.edu.tw The review process will be arranged for each submission individually, normally within 5 days after receiving the submission. The paper will be published online within one month after it is accepted.Submission format: Authors should use the MS-Word or Latex style files. Please visit: Author Style Guide & Templates for the submission template and upload the submission at the website: https://mc03.manuscriptcentral.com/clp-col with the type of “Special issue on Underwater Wireless Optical Communication”.
Chinese Optics Letters
  • May. 23, 2019
  • Vol.17, Issue (2019)
Special Issue
Chinese Optics Letters (COL) invites original articles for a Special Issue on Lithium Niobate Based Photonic Devices to be published in June 25 2021. Lithium niobate (LiNbO3) is a multifunctional crystal with combination of a number of excellent properties, such as electrooptical, acousto-optic, nonlinear optical, piezoelectric, and pyroelectric features. In optics and photonics, the LiNbO3-based devices have been widely applied in various aspects. Typical applications include acoustic- and electro-optic modulators, nonlinear wavelength converters, waveguide amplifiers, and quantum memories. The traditional LiNbO3 based photonic devices are constructed on micro-photonic structures, e.g., optical waveguides. A number of techniques have been utilized to produce low-loss LiNbO3 waveguides towards diverse applications. Recently, thin-film devices based on LiNbO3-On-Insulators (LNOI) technology have emerged as promising candidates due to the on-chip integration and strong confinement of light fields. Exciting LNOI-based devices, such as high speed modulators, highly efficient nonlinear optical elements, or hybrid quantum chips, have been developed through advanced techniques, showing distinguished performance for practical applications. There are continuous interests amid researchers on LiNbO3-based photonic devices and related applications, and a number of research groups are devoted to these interesting works. Regarding to these efforts and achievements, the scope of this special focus, covers all aspects of recent theoretical and experimental research related to LiNbO3–based photonic structures and devices. Specific areas of interest include, but not limited to:
Chinese Optics Letters
  • Oct. 14, 2020
  • Vol.19, Issue 6 (2021)
Special Issue
Chinese Optics Letters (COL) invites original articles for a Special Issue on Metal Halide perovskite and Their Applications to be published in March 2021. Within the last ten years, metal halide perovskites have excited the photovoltaic research community owing to their superior optical and electrical properties, ease of fabrication, low processing cost, and ease of bandgap tuning. In addition, they also hold great promise for optoelectronic and photonic applications, such as light-emitting diodes, photodetectors and lasers. Although a significant amount of research on metal halide perovskites has been conducted during the last few years, plenty of challenges to be addressed and opportunities to bring laboratory research to real-world devices lie ahead of researchers. For instance, 1) advance synthetic methodology with controllable compositions, dimensionality, morphologies and orientations; 2) establish and advance technology and instrumentation to study fundamental structural-properties as well as the light-matter interactions inside; and 3) develop integrated optoelectronic and photonic devices based on perovskites and to feed this knowledge back into the virtuous cycle of design, synthesis, measurement and application. In these regards, the scope of this special focus, covers all aspects of recent theoretical and experimental research related to metal halide perovskites.
Chinese Optics Letters
  • Feb. 21, 2020
  • Vol.19, Issue 3 (2021)
Special Issue
Compared with solid materials, soft matters have inherent advantages such as excellent adjustability, high flexibility, scalable size, ease of manufacture, and environmental adaptation. The various interesting properties of soft matter are not only worthy of basic research, but also inspires fantastic applications, especially in photonics. Therefore, this topic focuses on researches about liquid crystal and soft matter photonics. This special issue aims to attract research on soft matter photonics (Soft Mattonics) and promote the development of related applications.
Chinese Optics Letters
  • Feb. 06, 2020
  • Vol.18, Issue 8 (2020)
Special Issue
Underwater wireless optical communication (UWOC) has gained increasing research interest worldwide from both academic and industrial communities, because of its high bandwidth, compact antennas, low latency, cost-effectiveness, and low power consumption. In the underwater world, the wireless optical links can be complementary to or even more competitive than its acoustic counterpart. Nevertheless, the hostile underwater environment sets up natural obstacles to most information carriers, including the lightwave, even at the right wavelength. Much attention has been recently paid to this interesting and challenging area, leading to impressive progresses. Hence, we launched this focus issue to discuss recent advances and progress in UWOC, and aimed to further stimulate future advancements in this emerging field.
Chinese Optics Letters
  • Nov. 12, 2019
  • Vol.17, Issue 10 (2019)
Special Issue
Chinese Optics Letters (COL) invites original manuscript submissions for a Feature Issue on Extraordinary 2D Materials Based Nanophotonics to be published in February 2019. Extraordinary two-dimensional materials (E2DMs) beyond graphene such as black phosphorus (BP), Antimonene and MXene exhibit excellent optoelectronic and mechanical properties as well as high theoretical specific capacity, which make them potentially cover a broad wavelength range from mid-infrared to partial visible spectrum for light detection, modulation and generation applications.
Chinese Optics Letters
  • Mar. 11, 2019
  • Vol.17, Issue 2 (2019)
Special Issue
Chinese Optics Letters (COL) invites original manuscript submissions for a Special Issue on Advances in Metasurfaces to be published in May 2018. Metasurface refers to a type of artificial thin film materials with sub-wavelength features that can generate desired and/or new optical phenomena. The past decade has witnessed significant advances in metasurface ranging from fundamental physics to nanomanufacturing methods and practical application. Typical research efforts include wave-front engineering and focusing, polarization manipulation, light trapping and localization, absorption engineering and colorimetric display. Being able to manipulate the optical properties of metasurfaces will create new regimes of optical physics and impact a broad range of photonic, energy and biomedical technologies including new commercial product research and development. This special issue will include excellent review articles and original contributions covering the rapid advances and tremendous breadth of this emerging technical area.
Chinese Optics Letters
  • Mar. 13, 2019
  • Vol.16, Issue 5 (2018)
Special Issue
Two-dimensional (2D) noncarbon materials with outstanding optical properties are catching worldwide attentions on the heels of the discovery of graphene. Besides the large 2D family of transition metal dichalcogenides (TMDs), a series of new kind of mono-elemental 2D noncarbon materials, such as phosphorene, arsenene, antimonene and silicene, were recently emerging. The mentioned mono-elemental 2D materials shows unique properties like light emitting, non-linear optics, ultrafast optics, bio-related photonics and etc. The potential applications of these materials are in laser, ultrafast phtonics, biophotonics, optical modulation and optical devices. The scope of this special focus, covers all aspects of experimental research related to 2D noncarbon materials beyond graphene for optics, photonics and optoelectronics.
Chinese Optics Letters
  • Mar. 13, 2019
  • Vol.16, Issue 2 (2018)
Special Issue
Chinese Optics Letters (COL) invites original manuscript submissions for a Special Issue on Optical Methods for Life Sciences to be published in September 2017. This issue will focus on the cutting-edge optical techniques and its applications to brain sciences and immunology. Understanding the brain’s function and brain diseases has long been quested. Brain’s function depends on neuronal networks and therefore from a systems biology perspective, should be studied not only at the neuron level,but also at the neuronal networks and system levels. Optical imaging can be applied at multiple levels from gene to molecular, from cellular to tissue and from organ to system levels to yield critical information bridging molecular structure and physiological function. Along with the brain research, immunology attracts many researchers’ interest. Optical methods enable visualizing cellular and molecular events dynamically and thus serve as ideal tools for studying immune activities in vivo.
Chinese Optics Letters
  • Mar. 13, 2019
  • Vol.15, Issue 9 (2017)
Special Issue
The Chinese Optics Letters (COL) invites original manuscript submissions for a Special Issue on Complex Optical Fields to be published in March 2017. Recently there is an increasing interest in tailored optical fields with complex amplitude, phase, polarization spatial distributions and/or specifically designed temporal waveforms. Scalar optical vortices carrying orbital angular momentum and vectorial vortices such as radially, azimuthally polarized beams are among the most intensively studied examples. The added degrees of freedom arising from the amplitude, phase and polarization diversity within the beam cross-section and tailored waveforms enable scientists and engineers to break the limits imposed by conventional wisdom in many optical and photonic applications. Applications of these complex optical fields in promising areas and new commercial products continue to emerge. This special issue will include excellent review articles and original contributions covering the rapid advances and tremendous breadth of this emerging technical area.
Chinese Optics Letters
  • Mar. 13, 2019
  • Vol.15, Issue 3 (2017)
Special Issue
Microwave photonics is an inter-disciplinary field that studies the interaction between microwave and photonics for applications such as radar, sensors and telecommunication networks. The unique capabilities offered by photonics for processing ultra-wideband and high-frequency signals make it possible to have functions in microwave systems that are complex or even not directly possible in the radiofrequency domain. It has attracted great interest from both the research community and the commercial sector over the past 40 years and is set to have a bright future. We invite researchers in this field and related ones to contribute original research articles and review articles to this special issue on Microwave Photonics in Chinese Optics Letters.
Chinese Optics Letters
  • Mar. 13, 2019
  • Vol.15, Issue 1 (2017)
Special Issue
This year marks the 50th anniversary of the invention of the optical fiber communications. To celebrate this special occasion, the Chinese Optics Letters (COL) will publish a Special Issue for the 50th Anniversary of the Invention of Optical Fiber Communications in December 2016. The special issue will include invited papers that present the state-of-the-art results in various areas of optical fiber communications, to illustrate the great accomplishments made in this field through the collective efforts by optical communication researchers worldwide in the past half of a century.
Chinese Optics Letters
  • Mar. 13, 2019
  • Vol.14, Issue 12 (2016)
Special Issue
This feature issue is the second Joint Applied Optics (AO) and Chinese Optics Letters (COL) Feature Issue on digital holography and three-dimensional (3D) imaging. The first installment of such a joint feature issue was in 2011. In the present feature issue, there are a total of 24 papers in AO and 9 papers in COL. This feature issue contains a representative selection of topics that were presented at the OSA Topical Meeting on Digital Holography and 3D Imaging (DH), held in Shanghai, China, May 2015. The DH Topical Meeting is the world’s premier forum for science, technology, and applications of the digital holograph, and three-dimensional imaging and display methods. The topic areas include interferometry, phase microscopy, novel holographic processes, 3D and novel displays, integral imaging, computer-generated holograms, compressive holography, full-field tomography, and holography with various light sources, including coherent to incoherent and x-ray to terahertz waves. This is a highly interdisciplinary forum with applications in biomedicine, biophotonics, nanomaterials, nanophotonics, and scientific and industrial metrologies. All submitted papers, including invited papers, have undergone peer review. We hope these articles will present state-of-the-art technological developments that are currently under way and stimulate further novel applications of digital holography and 3D imaging. The next DH meeting is scheduled to be held on July 25–28, 2016, at Heidelberg, Germany. DH 2017 will take place in Korea.
Chinese Optics Letters
  • Mar. 13, 2019
  • Vol.14, Issue 1 (2016)
Special Issue
With the rapid development of ultrafast intense laser technologies, the interaction of intense laser radiation with mat- ter has been a frontier for few decades. The International Conference on Multiphoton Processes (ICOMP), initiated in 1977, covers the latest advances in the field every three years. The special issue is based on the spirit of the 13th International Conference on Multi-Photon Processes, ICOMP13, which was held in Shanghai, organized by Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, on Dec. 7-10, 2014. This special issue of Chinese Optics Letters contains a collection of articles originating from the ICOMP13. The con- ference focused on nonlinear optical interaction, multiphoton processes, strong field ionization of atoms and molecules, quantum control of atomic and molecular dynamics, intense laser-field science, laser acceleration of electron and ions, imaging of electronic and nuclear dynamics, XFEL and XUV pulse generation, and laser machining.
Chinese Optics Letters
  • Mar. 13, 2019
  • Vol.13, Issue 7 (2015)
Articles: on the Cover
Optical microring resonators are extensively employed in a wide range of physical studies and applications due to the resonance enhancement property. Incorporating coupling control of a microring resonator is necessary in many scenarios, but modifications are essentially added to the resonator and impair the capability of optical enhancement. Here, we propose a flexible coupling structure based on adiabatic elimination that allows low-loss active coupling control without any modifications to the resonators. The self-coupling coefficient can be monotonically or non-monotonically controllable by the proposed coupler, potentially at a high speed. The characteristic of the coupler when implemented in silicon microring resonators is investigated in detail using substantiated analytical theory and experiments. This work provides a general method in coupling control while ensuring the resonance enhancement property, making active coupling control in a resonator-waveguide system feasible.
Chinese Optics Letters
  • Feb. 28, 2020
  • Vol.18, Issue 1 (2020)