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The image on the cover for Advanced Photonics Volume 3, Issue 3, depicts tunneling ionization of an atom, as induced by a strong laser pulse. The complex hologram in the photoelectron momentum spectrum, which encodes rich structural and dynamic information of the atom, originates from the interference of the photoelectrons tunneling at different times during the laser pulse. By introducing a weak second harmonic field, the contributions of the photoelectrons tunneling at different times are identified, a significant step toward imaging the ultrafast dynamics in atoms and molecules with the photoelectron spectroscopy of tunneling ionization.The image is based on original research by Jia Tan et al. presented in their paper “Resolving and weighing the quantum orbits in strong-field tunneling ionization,” Adv. Photon.3(3), 035001 (2021).

Photonics Insights will be a high-quality，peer-reviewed, Diamond Open Access journal. It will feature review articles which present the current status of a given topic, with background, research progress, conclusions, and possible future developments.

The image on the cover of Photonics Research Volume 9, Issue 4, demonstrates temperature tunable spectral broadening using a nonlinear ultra-silicon-rich nitride device consisting of a 3-mm-long cladding-modulated Bragg grating and a 7-mm-long nonlinear channel waveguide. Provided by Y. Cao et al., researchers from Singapore University of Technology and Design, Ecole Polytechnique F&eacute;d&eacute;rale de Lausanne, Institute of Microelectronics, A*STAR and The University of Sydney, the image is based on the research presented in their article "Thermo-optically tunable spectral broadening in a nonlinear ultra-silicon-rich nitride Bragg grating", Photonics Research 9(4) 04000596, doi 10.1364/PRJ.411073.

The image on the cover of Chinese Optics Letters Volume 19, Issue 4, indicates that a new type of optical bi-layer metasurface system is designed and studied, which is based on subwavelength metal slit arrays with phase-gradient modulation, referred to as metagratings (MGs). Provided by Q. Shi et al., researchers from Soochow University, Nanjing University of Aeronautics and Astronautics and North University of China, the image is based on the research presented in their article "Optical beam splitting and asymmetric transmission in bi-layer metagratings", Chinese Optics Letters 19(4) 042602, doi 10.3788/COL202119.042602.

The image on the cover of Photonics Research Volume 9, Issue 3, presents a new imaging modality, deep compressed imaging via optimized-pattern scanning, which can significantly increase the acquisition speed for a single-detector-based imaging system. Provided by K. Zhang, J. Hu and W. Yang, researchers from University of California, the image is based on the research presented in their article "Deep compressed imaging via optimized pattern scanning", Photonics Research 9(3) 03000B57, doi 10.1364/PRJ.410556.

Editors' Picks
Mode-locked lasers are the building blocks to generate ultrafast pulses which can then be used for many applications, including optical communication, metrology, spectroscopy, microscopy, material processing, as well as many applications in the healthcare industry. Mode-locked fiber lasers are especially popular for their compactness, efficiency, and beam quality compared to their solid-state counterparts. Apart from their practicality, the mode-locked fiber lasers are an interesting object for studies, as they represent dynamically rich nonlinear systems.
Photonics Research
• Jul. 16, 2021
• Vol. 9, Issue 6 (2021)
Editors' Picks
With the tremendous growth of modern wireless communications, crowded spectrum and waste of spectrum resources which limit the application of various wireless technologies, become the important issues, especially in beyond fifth generation (B5G) and sixth generation (6G) communications. Therefore, it is increasingly urgent to enhance spectrum utilization efficiency and to increase the wireless network capacity. Compared with the traditional frequency division duplex (FDD) and time division duplex (TDD), the in-band full-duplex (IBFD) technology transmitting and receiving signals simultaneously on the same frequency can double the spectrum utilization efficiency and data transmission rate, and has a great potential application in the new generation of mobile communications and satellite communications. However, in the process of IBFD communication, the transmitting antenna and the receiving antenna are generally on the same platform, the high-power signal sent from the transmitting antenna will interfere the low-power signal of interest (SOI) that is received by the receiving antenna, or even submerge it completely, which is called radio frequency (RF) self-interference. This kind of interference is at the same frequency as the SOI, so it is impossible to filter it out by a notch filter or to select the SOI by a narrow band pass filter. Therefore, RF self-interference is a key issue to be resolved for the application of IBFD technology.
Chinese Optics Letters
• Jul. 13, 2021
• Vol. 19, Issue 7 (2021)
Editors' Picks
Intense, femtosecond laser pulses have for the last several decades been used for studies of ultrafast dynamics in atomic, molecular, and condensed matter systems. More recently, the development of techniques for nonlinear pulse compression to the single-optical-cycle limit and for stabilizing and controlling the carrier-envelope phase (the phase difference between the peak of the pulse envelope and the closest maximum of the oscillating electric field) has enabled the conversion of intense laser pulses into extreme ultraviolet attosecond pulses and ignited the field of attosecond science.
Photonics Research
• Jul. 09, 2021
• Vol. 9, Issue 6 (2021)
HPL Highlights
The mid-infrared wavelength ranges from 2 to 15 μm is of great interest for many interesting applications such as remote sensing and free-space optical communications, but this spectral range has not been fully explored due to the lack of laser sources. In particular, the 3-8 μm range is called of the "molecular fingerprint" region because of the abundant absorption lines from almost most chemicals. These molecular fingerprints are very useful for chemical sensing in combination with broadband or tunable mid-infrared laser beams.
High Power Laser Science and Engineering
• Jul. 08, 2021
• Vol. 9, Issue 2 (2021)
Spotlight on Optics
A new round of scientific and technological revolution is on-going around the world, Internet technology and smart terminals are constantly developing. Especially after the outbreak of COVID-19 in 2020, emerging businesses such as online education, online office, and online medical services have developed rapidly. The role of the Internet as an infrastructure to support the development of human society has become increasingly prominent.
Photonics Research
• Jul. 01, 2021
• Vol. 9, Issue 5 (2021)
Water-stable CsPbBr3 perovskite quantum-dot luminous fibers fabricated by centrifugal spinning for dual white light illumination and communication

Lead halide perovskite quantum dots (PQDs) display remarkable photoelectric performance. However, defects such as weak stability in air and water environm

Lead halide perovskite quantum dots (PQDs) display remarkable photoelectric performance. However, defects such as weak stability in air and water environments limit the development of lead halide PQDs in solid-state light applications. Herein, centrifugal spinning is used for the fabrication of stable luminous $CsPbBr3$ PQD nanofibers. After immersion in water for 11 months, the PQD fibers still maintained considerable photoluminescence quantum yield, showing high stability in hostile environments. The water-stability mechanism of the fibers can be explained by the changing defect density, crystal growth of PQDs, and the molecular transformation at the fiber surface. The white LED based on the $CsPbBr3$ fibers exhibits satisfying color gamut performance (128% of National Television System Committee). Due to the short photoluminescence lifetime of $CsPbBr3$ PQDs, the communication potential is also considered. The $CsPbBr3$ fibers obtained by centrifugal spinning present a bandwidth of 11.2 MHz, showing promising performance for solid-state light and visible light communication applications.show less

• Aug.02，2021
• Photonics Research,Vol. 9, Issue 8
• 08001559 (2021)
Dynamic performance and reflection sensitivity of quantum dot distributed feedback lasers with large optical mismatch

This work reports on a high-efficiency InAs/GaAs distributed feedback quantum dot laser. The large optical wavelength detuning at room temperature between

This work reports on a high-efficiency InAs/GaAs distributed feedback quantum dot laser. The large optical wavelength detuning at room temperature between the lasing peak and the gain peak causes the static, dynamic, and nonlinear intrinsic properties to all improve with temperature, including the lasing efficiency, the modulation dynamics, the linewidth enhancement factor, and consequently the reflection insensitivity. Results reported show an optimum operating temperature at 75°C, highlighting the potential of the large optical mismatch assisted single-frequency laser for the development of uncooled and isolator-free high-speed photonic integrated circuits.show less

• Aug.02，2021
• Photonics Research,Vol. 9, Issue 8
• 08001550 (2021)
Negative refraction of ultra-squeezed in-plane hyperbolic designer polaritons

The in-plane negative refraction of high-momentum (i.e., high-show less

• Aug.02，2021
• Photonics Research,Vol. 9, Issue 8
• 08001540 (2021)
Nonlinear Fourier transform enabled eigenvalue spectrum investigation for fiber laser radiation

Fiber lasers are a paradigm of dissipative systems, which distinguish themselves from a Hamilton system where energy is conservative. Consequently, pulses

Fiber lasers are a paradigm of dissipative systems, which distinguish themselves from a Hamilton system where energy is conservative. Consequently, pulses generated in a fiber laser are always accompanied by the continuous wave (CW). Under certain hypothesis, pulses generated in a fiber laser can be considered as a soliton, a product of a Hamilton system. Therefore, all the descriptions of solitons of a fiber laser are approximate. Coexistence of solitons and the CW from a fiber laser prevents unveiling of real nonlinear dynamics in fiber lasers, such as soliton interactions. Pulse behavior in a fiber laser can be represented by the state of single pulse, the state of period doubling of single pulse, the states of two pulses either tightly bound or loosely distributed, the states of three pulses, and various combinations of the above-mentioned states. Recently, soliton distillation was proposed and numerically demonstrated based on the nonlinear Fourier transform (NFT) [J. Lightwave Technol.39, 2542 (2021)JLTEDG0733-872410.1109/JLT.2021.3051036]. Solitons can be separated from the coherent CW background. Therefore, it is feasible to isolate solitons from CW background in a fiber laser. Here, we applied the NFT to various pulses generated in a fiber laser, including single pulse, single pulse in period doubling, different double pulses, and multiple pulses. Furthermore, with the approach of soliton distillation, the corresponding pure solitons of those pulses are reconstructed. Simulation results suggest that the NFT can be used to identify soliton dynamics excluding CW influence in a fiber laser, which paves a new way for uncovering real soliton interaction in nonlinear systems.show less

• Aug.02，2021
• Photonics Research,Vol. 9, Issue 8
• 08001531 (2021)

In this paper, a high-power and high-efficient 4.3 µm mid-infrared (MIR) optical parametric oscillator (OPO) based on ZnGeP2 (ZGP) crystal is demonstrated. An acousto-optically (AO) Q-s

In this paper, a high-power and high-efficient 4.3 µm mid-infrared (MIR) optical parametric oscillator (OPO) based on ZnGeP2 (ZGP) crystal is demonstrated. An acousto-optically (AO) Q-switched Ho:YAG laser operating at 2.1 µm with a maximum average output power of 35 W and pulse width of 38 ns at a repetition rate of 15 kHz is established and employed as the pump source. A doubly-resonant OPO (DRO) is designed and realized with the total MIR output power of 13.27 W, including the signal and idler output power of 2.65 W@4.07 µm and 10.62 W @4.3 µm. The corresponding total optical-to-optical and slope efficiency are 37.9% and 67.1%, respectively. The shortest pulse width, the beam quality factor and the output power instability are measured to be 36 ns, Mx2=1.8, My2=2.0 and RMS<1.9%@8 hours, respectively. Our results pave a way for designing high-power and high-efficient 4-5 µm MIR laser sources.show less

• Aug.02，2021
• Chinese Optics Letters,Vol. 20, Issue 1
• (2022)

A tunable multi-wavelength EDFL with precise wavelength interval control is reported theoretically and experimentally in this paper. It is made up of MZI filter and Sagnac filter, and s

A tunable multi-wavelength EDFL with precise wavelength interval control is reported theoretically and experimentally in this paper. It is made up of MZI filter and Sagnac filter, and supplemented by four-wave-mixing effect. Compared with other filters, the proposed MZI filter based on the fused taper technology can change the wavelength interval more flexibly. The experiment result shows that the wavelength tuning can be achieved and the tuning range can reach ~15nm. Moreover, the variation in the number of wavelengths are also realized. The maximum SMSR can reach 39dB. show less

• Aug.02，2021
• Chinese Optics Letters,Vol. 20, Issue 1
• (2022)

A new unsaturated wind-chime model is proposed for calculating the formation time of the diffraction rings induced by spatial self-phase modulation (SSPM) in molybdenum disulfide suspen

A new unsaturated wind-chime model is proposed for calculating the formation time of the diffraction rings induced by spatial self-phase modulation (SSPM) in molybdenum disulfide suspension. To optimize the traditional wind-chime model, the concentration variable of 2D material was introduced. The results of the unsaturated wind-chime model match quite well with the SSPM experimental results of molybdenum disulfide. Based on this model, the shortest formation time of diffraction rings and their corresponding concentration and light intensity can be predicted using limited data. Theoretically, by increasing the viscosity coefficient of the solution, the response time of the diffraction ring, to reach the maximum value, can be significantly reduced. It has advanced significance in shortening the response time of photonic diodes. show less

• Aug.02，2021
• Chinese Optics Letters,Vol. 20, Issue 1
• (2022)

In this paper, we use electromagnetic simulations to systematically investigate the influence of a thin dielectric layer on the local electric field and molecular spectroscopy in the pl

In this paper, we use electromagnetic simulations to systematically investigate the influence of a thin dielectric layer on the local electric field and molecular spectroscopy in the plasmonic junction. It is found that both the intensity and spatial confinement of the electric field and the molecular spectroscopy can be significantly enhanced by applying a dielectric layer with large dielectric constant. We also discuss the optimal dielectric layer thickness to obtain the largest quantum efficiency of a dipole emitter. These results may be instructive for further studies in molecular spectroscopy and optoelectronics in plasmonic junctions.show less

• Aug.02，2021
• Chinese Optics Letters,Vol. 19, Issue 12
• (2021)
Guilin, ChinaAugust 25-27, 2021
The image on the cover for Advanced Photonics Volume 3, Issue 3, depicts tunneling ionization of an atom, as induced by a strong laser pulse. The complex hologram in the photoelectron momentum spectrum, which encodes rich structural and dynamic information of the atom, originates from the interference of the photoelectrons tunneling at different times during the laser pulse. By introducing a weak second harmonic field, the contributions of the photoelectrons tunneling at different times are identified, a significant step toward imaging the ultrafast dynamics in atoms and molecules with the photoelectron spectroscopy of tunneling ionization.The image is based on original research by Jia Tan et al. presented in their paper “Resolving and weighing the quantum orbits in strong-field tunneling ionization,” Adv. Photon.3(3), 035001 (2021).
• Journal
• 20th Jul，2021
The image on the cover of Photonics Research Volume 9, Issue 4, demonstrates temperature tunable spectral broadening using a nonlinear ultra-silicon-rich nitride device consisting of a 3-mm-long cladding-modulated Bragg grating and a 7-mm-long nonlinear channel waveguide. Provided by Y. Cao et al., researchers from Singapore University of Technology and Design, Ecole Polytechnique F&eacute;d&eacute;rale de Lausanne, Institute of Microelectronics, A*STAR and The University of Sydney, the image is based on the research presented in their article "Thermo-optically tunable spectral broadening in a nonlinear ultra-silicon-rich nitride Bragg grating", Photonics Research 9(4) 04000596, doi 10.1364/PRJ.411073.
• Journal
• 27th Apr，2021