On the Cover: Highly integrated photonic crystal bandedge lasers monolithically grown on Si substrates
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On the Cover: Correlated triple hybrid amplitude and phase holographic encryption based on a metasurface
On the Cover: Silicon-integrated nonlinear III-V photonics
On the Cover: Femtosecond laser textured porous nanowire structured glass for enhanced thermal imaging

The image on the cover for Chinese Optics Letters Volume 20, Issue 4, indicates that an InAs/GaAs quantum dot photonic crystal bandedge laser, which is directly grown on an on-axis Si (001) substrate, which provides a feasible route towards a low-cost and large-scale integration method for light sources on the Si platform was achieved under the pumping condition of a continuous-wave 632.8 nm He–Ne gas laser at room temperature.The image is based on original research by Yaoran Huang et al. presented in their paper "Highly integrated photonic crystal bandedge lasers monolithically grown on Si substrates", Chinese Optics Letters 20 (4), 041401 (2022).

The image on the cover for Photonics Research Volume 10, Issue 3, demonstrates a correlated triple amplitude and phase holographic encryption based on an all-dielectric metasurface. An optimized holographic algorithm is developed to obtain quantitatively correlated triple holograms, which can encrypt information in multiple wavelength and polarization channels.The image is based on original research by Hongqiang Zhou et al. presented in their paper "Correlated triple hybrid amplitude and phase holographic encryption based on a metasurface", Photonics Research 10 (3), 03000678 (2022).

The image on the cover for Photonics Research Volume 10, Issue 2, demonstrates low-loss AlGaAs-on-SOI photonic circuits with integrated Si waveguides and showcase sub-milliwatt-threshold (∼0.25mW∼0.25mW) Kerr frequency comb generation in ultrahigh-??Q AlGaAs microrings (??Q over 106106) at the telecom bands.The image is based on original research by Weiqiang Xie et al. presented in their paper "Silicon-integrated nonlinear III-V photonics", Photonics Research 10 (2), 02000535 (2022).

The image on the cover for Chinese Optics Letters Volume 20, Issue 3, introduces a simple and effective method to process porous glass by femtosecond laser scanning, where distributed nanocavities and nanowires were produced, which caused improvement of the treated glass emissivity. The image is based on original research by Tingni Wu et al. presented in their paper "Femtosecond laser textured porous nanowire structured glass for enhanced thermal imaging", Chinese Optics Letters 20 (3), 033801 (2022).

Community-News
the 36th European Conference on Laser Interaction with Matter
ECLIM2022, the 36th European Conference on Laser Interaction with Matter will be held in Frascati, Italy on 19-23 September 2022.
High Power Laser Science and Engineering
  • May. 12, 2022
  • Vol. , Issue (2022)
Community-News
International Conference on X-Ray Laser 2022 (Both online and offline)
The ICXRL was established to promote advanced extreme UV and X-ray sources, and their application in physics, (bio-)chemistry, and materials science. Joining ICXRL means experiencing the latest trends, and shaping the future progress. Latest results on state-of-the-art X-ray Free-Electron Lasers (XFEL) as well as tabletop systems are presented. Lecturers are expected to submit a peer-reviewed paper for the SPIE monograph.
High Power Laser Science and Engineering
  • May. 12, 2022
  • Vol. , Issue (2022)
Spotlight on Optics
Phase-only Metasurfaces For Polarization-Multiplexed Holographic
With the development of virtual reality (VR) and augmented reality (AR) technology, the existing display technology is facing challenges and opportunities for providing vivid experience. Among many display technologies, holography shows extraordinary advantages in multi-dimensional optical recording and reconstruction, and is envisioned as the way to the ultimate visual feast.
Photonics Research
  • May. 11, 2022
  • Vol. 10, Issue 4 (2022)
Editors' Picks
Deep learning-based scattering removal of light field imaging
Light field imaging is a 3D imaging technology. In light field imaging, the projection of 3D object to light field information on 2D image plane (including spatial and directional information of incident light) will be conducted by micro-lens array. Then 3D reconstruction of object will be realized through the processing of light field information. Light field imaging has the feature of high-temporal-resolution with scanning-free 3D imaging process and has no requirement of special illumination. Therefore, light field imaging has shown significance in research fields and applications, such as biological imaging, industrial measurement and machine vision.
Chinese Optics Letters
  • May. 07, 2022
  • Vol. 20, Issue 4 (2022)
On the Cover
N-polar InGaN/GaN nanowires: overcoming the efficiency cliff of red-emitting micro-LEDs
High efficiency, high brightness, and robust micro or sub-microscale light emitting diodes (LEDs) are essential components of emerging virtual/augmented reality devices and systems as well as future ultrahigh resolution mobile displays. Realization of such ultra-small LEDs can also allow large scale integration of electronic and optoelectronic devices on the same chip.
Photonics Research
  • May. 03, 2022
  • Vol. 10, Issue 4 (2022)
Newest Articles
Ultra-compact post-compressor on-shot wavefront measurement for beam correction at PHELIX

In order to reach the highest intensities, modern laser systems use adaptive optics to control their beam quality. Ideally, the focal spot is optimized af

In order to reach the highest intensities, modern laser systems use adaptive optics to control their beam quality. Ideally, the focal spot is optimized after the compression stage of the system in order to avoid spatio-temporal couplings. This also requires a wavefront sensor after the compressor, which should be able to measure the wavefront on-shot. At PHELIX, we have developed an ultra-compact post-compressor beam diagnostic due to strict space constraints, measuring the wavefront over the full aperture of 28 cm. This system features all-reflective imaging beam transport and a high dynamic range in order to measure the wavefront in alignment mode as well as on shot.show less

  • May.21,2022
  • High Power Laser Science and Engineering,Vol. 10, Issue 3
  • 03000e18 (2022)
Silicon nitride passive and active photonic integrated circuits: trends and prospects

The use of silicon nitride in integrated photonics has rapidly progressed in recent decades. Ultra-low-loss waveguides based on silicon nitride are a favo

The use of silicon nitride in integrated photonics has rapidly progressed in recent decades. Ultra-low-loss waveguides based on silicon nitride are a favorable platform for the research of nonlinear and microwave photonics and their application to a wide variety of fields, including precision metrology, communications, sensing, imaging, navigation, computation, and quantum physics. In recent years, the integration of Si and III-V materials has enabled new large-scale, advanced silicon nitride-based photonic integrated circuits with versatile functionality. In this perspective article, we review current trends and the state-of-the-art in silicon nitride-based photonic devices and circuits. We highlight the hybrid and heterogeneous integration of III-V with silicon nitride for electrically pumped soliton microcomb generation and ultra-low-noise lasers with fundamental linewidths in the tens of mHz range. We also discuss several ultimate limits and challenges of silicon nitride-based photonic device performance and provide routes and prospects for future development.

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  • May.21,2022
  • Photonics Research,Vol. 10, Issue 6
  • 06000A82 (2022)
Neural network-based surrogate model for inverse design of metasurfaces

Metasurfaces composed of spatially arranged ultrathin subwavelength elements are promising photonic devices for manipulating optical wavefronts, with pote

Metasurfaces composed of spatially arranged ultrathin subwavelength elements are promising photonic devices for manipulating optical wavefronts, with potential applications in holography, metalens, and multiplexing communications. Finding microstructures that meet light modulation requirements is always a challenge in designing metasurfaces, where parameter sweep, gradient-based inverse design, and topology optimization are the most commonly used design methods in which the massive electromagnetic iterations require the design computational cost and are sometimes prohibitive. Herein, we propose a fast inverse design method that combines a physics-based neural network surrogate model (NNSM) with an optimization algorithm. The NNSM, which can generate an accurate electromagnetic response from the geometric topologies of the meta-atoms, is constructed for electromagnetic iterations, and the optimization algorithm is used to search for the on-demand meta-atoms from the phase library established by the NNSM to realize an inverse design. This method addresses two important problems in metasurface design: fast and accurate electromagnetic wave phase prediction and inverse design through a single phase-shift value. As a proof-of-concept, we designed an orbital angular momentum (de)multiplexer based on a phase-type metasurface, and 200 Gbit/s quadrature-phase shift-keying signals were successfully transmitted with a bit error rate approaching 1.67×10-6. Because the design is mainly based on an optimization algorithm, it can address the “one-to-many” inverse problem in other micro/nano devices such as integrated photonic circuits, waveguides, and nano-antennas.show less

  • May.21,2022
  • Photonics Research,Vol. 10, Issue 6
  • 06001462 (2022)
Evanescent waveguide lab-on-chip for optical biosensing in food quality control

Optical biosensing systems are commonly developed assembling a source, a light–sample interaction area, and a detector as distinct stand-alone elements. W

Optical biosensing systems are commonly developed assembling a source, a light–sample interaction area, and a detector as distinct stand-alone elements. We present a compact, inexpensive, and easy-to-use glass chip that monolithically integrates both the interaction and detection elements in a 1 cm2 overall surface. The device working principle is based on evanescent wavelight interaction with the complex refractive index of a liquid mixture, being the index influenced by the mixture’s physical and chemical features. We describe the manufacture of a prototype able to perform investigations on food quality and subsequent tests on the detection of fat content in milk. Theoretical investigations are reported as well as measurements performed on samples in the green spectrum. A sensitivity of about 139 fA/(g/dL) and a limit of detection of 14 ppm have been achieved, better than those of current commercial devices.show less

  • May.21,2022
  • Photonics Research,Vol. 10, Issue 6
  • 06001453 (2022)
Optics Physics Geography

We report on the generation and delivery of 10.2 PW peak power laser pulses, using the High Power Laser System (HPLS) at the Extreme Laser Infrastructure – Nuclear Physics (ELI-NP). In

We report on the generation and delivery of 10.2 PW peak power laser pulses, using the High Power Laser System (HPLS) at the Extreme Laser Infrastructure – Nuclear Physics (ELI-NP). In this work we demonstrate for the first time, to the best of our knowledge, the compression and propagation of full energy, full aperture, laser pulses that reach a power level of more than 10 PW.show less

  • May.21,2022
  • High Power Laser Science and Engineering

ZIF-8, a metal-organic framework (MOF) with a non-centrosymmetric crystal structure, which exhibit nonlinear optics properties and can act as the nanoporous matrix of guest molecules. A

ZIF-8, a metal-organic framework (MOF) with a non-centrosymmetric crystal structure, which exhibit nonlinear optics properties and can act as the nanoporous matrix of guest molecules. Amorphization of ZIF-8 can be achieved by pressure or high temperature. Both crystalline and amorphous states have their inherent features for optical applications. The effects of the crystalline-amorphous transition on the structural and optical properties under pressure were investigated in detail. Amorphization leads to the destruction of the ZIF-8 lattice structure, collapse of pores, and the change of spatial symmetry, which in turn alters the NLO properties of ZIF-8 and the luminescence properties of the guest Eu cations. Our results establish the structure-optical properties relationship in the amorphization process and provide new clues in designing novel MOFs optical materials. show less

  • May.21,2022
  • Chinese Optics Letters,Vol. 20, Issue 9
  • (2022)

A real-time imaging system based on a compact terahertz laser is constructed by employing one off-axis parabolic mirror and one silicon lens. Terahertz imaging of water, water stains, l

A real-time imaging system based on a compact terahertz laser is constructed by employing one off-axis parabolic mirror and one silicon lens. Terahertz imaging of water, water stains, leaf veins, human hairs and metal wire is demonstrated. An imaging resolution of 68 μm is achieved. The experiments show that this compact and simplified imaging system is suitable for penetration demonstration of terahertz light, water distribution measurement and imaging analysis of thin samples. show less

  • May.21,2022
  • Chinese Optics Letters,Vol. 20, Issue 9
  • (2022)

The conventional wavelength modulation spectroscopy (WMS) is vulnerable to the influence of low-frequency noise. Accuracy of the method highly depends on the performance of the costly l

The conventional wavelength modulation spectroscopy (WMS) is vulnerable to the influence of low-frequency noise. Accuracy of the method highly depends on the performance of the costly lock-in amplifier. In this article, we report a new and effective method for reconstructing second-harmonic signals through WMS based on fast Fourier transform (FFT). This method is less disturbed by low-frequency noise because it does not use low-frequency ramp wave. Formulation and detection procedure were presented. The discrete second-harmonic waveform can be obtained by continuously changing the DC signal and FFT analysis in this method. Second-harmonic waveform acquired by the two means are generally consistent. The experimental study validates the obtained gas concentration from 5% to 30% shows a good linear relationship by the proposed method. The maximum relative errors on concentration extraction is 2.87%, as for conventional WMS, this value is 4.50%. The developed measurement method may have potential in computed tomography.show less

  • May.21,2022
  • Chinese Optics Letters,Vol. 20, Issue 9
  • (2022)
The image on the cover for Chinese Optics Letters Volume 20, Issue 4, indicates that an InAs/GaAs quantum dot photonic crystal bandedge laser, which is directly grown on an on-axis Si (001) substrate, which provides a feasible route towards a low-cost and large-scale integration method for light sources on the Si platform was achieved under the pumping condition of a continuous-wave 632.8 nm He–Ne gas laser at room temperature.The image is based on original research by Yaoran Huang et al. presented in their paper "Highly integrated photonic crystal bandedge lasers monolithically grown on Si substrates", Chinese Optics Letters 20 (4), 041401 (2022).
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  • 18th Apr,2022
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  • 29th Mar,2022