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The image on the cover for Chinese Optics Letters Volume 20, Issue 5, reports reflective photon nanosieves that consist of metallic meta-mirrors sitting on a transparent quartz substrate. Upon illumination, these meta-mirrors offer the reflectance of &sim;50%, which is higher than the transmission of visible light through diameter-identical nanoholes.The image is based on original research by Samia Osman Hamid Mohammed et al. presented in their paper "Efficiency-enhanced reflective nanosieve holograms", Chinese Optics Letters 20 (5), 053602. (2022)

The image on the cover for Photonics Research Volume 10, Issue 4, reports the demonstration of an N-polar InGaN/GaN nanowire sub-microscale LED emitting in the red spectrum that can overcome the efficiency cliff of conventional red-emitting micro-LEDs. The image is based on original research by A. Pandey et al. presented in their paper "N-polar InGaN/GaN nanowires: overcoming the efficiency cliff of red-emitting micro-LEDs", Photonics Research 10 (4), 04001107 (2022).

The image on the cover for Advanced Photonics Volume 4 Issue 2 illustrates a schematic of a Mueller matrix measurement system and a conceptional Mueller matrix of the sample (4x4 matrix), as well as the related vectorial properties of the light beams.The image is based on original research presented in the article by Chao He, Jintao Chang, Patrick S. Salter, Yuanxing Shen, Ben Dai, Pengcheng Li, Yihan Jin, Samlan Chandran Thodika, Mengmeng Li, Tariq Aziz, Jingyu Wang, Jacopo Antonello, Yang Dong, Ji Qi, Jianyu Lin, Daniel S. Elson, Min Zhang, Honghui He, Hui Ma, and Martin J. Booth, “ Revealing complex optical phenomena through vectorial metrics,” Adv. Photon. 4(2), 026001 (2022), doi 10.1117/1.AP.4.2.026001.

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&ndash;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).

Community-News
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
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
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
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
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)
Geometric metasurface for polarization synthesis and multidimensional multiplexing of terahertz converged vortices

The investigation of converged twisted beams with a helical phase structure has a remarkable impact on both fundamental physics and practical applications

The investigation of converged twisted beams with a helical phase structure has a remarkable impact on both fundamental physics and practical applications. Geometric metasurfaces consisting of individually orientated metal/dielectric meta-atoms provide an ultracompact platform for generating converged vortices. However, it is still challenging to simultaneously focus left-handed and right-handed circularly polarized incident beams with pure geometric phase modulation, which hinders the independent operation on topological charges between these two helical components. Here we propose and experimentally demonstrate an approach to design terahertz geometric metasurfaces that can generate helicity-independent converged vortices with homogeneous polarization states by the superposition of two orthogonal helical vortices with identical topological charges. Furthermore, the multiplexing of polarization-rotatable multiple vortices in multiple dimensions, i.e., in both longitudinal and transverse directions, and a vortex with an extended focal depth is confirmed by embedding polarization modulation into the geometric metasurfaces. The demonstrated approach provides a new way to simultaneously manipulate orthogonal helical components and expand the design dimension, enabling new applications of geometric metasurface devices in polarization optics, twisted-beam related image and edge detection, high capacity optical communication, and quantum information processing, to name a few.show less

• May.29，2022
• Photonics Research,Vol. 10, Issue 6
• 06001517 (2022)
Zero field optically pumped magnetometer with independent dual-mode operation

We propose a dual-mode optically pumped magnetometer (OPM) that can flexibly switch between single-beam modulation mode and double-beam DC mode. Based on

We propose a dual-mode optically pumped magnetometer (OPM) that can flexibly switch between single-beam modulation mode and double-beam DC mode. Based on a $4 mm×4 mm×4 mm$ miniaturized vapor cell, the double-beam DC mode achieves a sensitivity of $7 fT/Hz1/2$ with probe noise below $4 fT/Hz1/2$ and working bandwidth over 65 Hz. This mode is designed to precisely measure the noise floor of a mu-metal magnetic shield. The single-beam modulation mode (sensitivity $20 fT/Hz1/2$) exhibits bandwidth characteristics suitable for biomagnetic measurements. Thus, our design is suitable for a miniaturized OPM with multiple functions, including magnetic-shield background noise measurement and medical imaging.show less

• May.29，2022
• Chinese Optics Letters,Vol. 20, Issue 8
• 081202 (2022)
Four-quadrant demodulation fiber sensor for wavelength monitoring of a wavelength phase-shifting interferometer

Real-time monitoring of wavelength is important for high-speed wavelength phase-shifting interferometry. In this paper, a wavelength sensor based on a pol

Real-time monitoring of wavelength is important for high-speed wavelength phase-shifting interferometry. In this paper, a wavelength sensor based on a polarization-maintaining fiber interferometer with four-quadrant demodulation was proposed. We built the wavelength sensing system with resolution better than 0.005 pm and 0.1 ms sampling interval and measured the response time of the tuned wavelength at 35 ms in the phase-shifting process of a commercial wavelength phase-shifting free-space interferometer, as well as the wavelength drift velocity of 0.01 pm per second in the hysteresis process. The optical fiber wavelength sensor with four-quadrant demodulation provides a real-time wavelength sensing scheme for high-speed wavelength phase-shifting interferometers.show less

• May.29，2022
• Chinese Optics Letters,Vol. 20, Issue 8
• 081201 (2022)
FAANet: feature-aligned attention network for real-time multiple object tracking in UAV videos

Multiple object tracking (MOT) in unmanned aerial vehicle (UAV) videos has attracted attention. Because of the observation perspectives of UAV, the object

Multiple object tracking (MOT) in unmanned aerial vehicle (UAV) videos has attracted attention. Because of the observation perspectives of UAV, the object scale changes dramatically and is relatively small. Besides, most MOT algorithms in UAV videos cannot achieve real-time due to the tracking-by-detection paradigm. We propose a feature-aligned attention network (FAANet). It mainly consists of a channel and spatial attention module and a feature-aligned aggregation module. We also improve the real-time performance using the joint-detection-embedding paradigm and structural re-parameterization technique. We validate the effectiveness with extensive experiments on UAV detection and tracking benchmark, achieving new state-of-the-art 44.0 MOTA, 64.6 IDF1 with 38.24 frames per second running speed on a single 1080Ti graphics processing unit.show less

• May.29，2022
• Chinese Optics Letters,Vol. 20, Issue 8
• 081101 (2022)

A home-made low loss Bi/P co-doped silica fiber was fabricated using the modified chemical vapor deposition technique (MCVD) combined with the solution doping method, where the backgrou

A home-made low loss Bi/P co-doped silica fiber was fabricated using the modified chemical vapor deposition technique (MCVD) combined with the solution doping method, where the background loss at 1550 nm was as low as 17 dB/km. We demonstrated for the first time an all-fiber amplifier using the home-made Bi/P co-doped fiber achieving the broadband amplification in E-band. The amplifying performance was evaluated and optimized with different pumping pattern and fiber length. A maximum net gain at 1355 nm close to 20 dB and a minimum NF of 4.6 dB were obtained for the first time using two 1240 nm LDs under bidirectional pumping with the input pump and signal power of 870 mW and -30 dBm，respectively. show less

• May.29，2022
• Chinese Optics Letters,Vol. 20, Issue 10
• (2022)

Metasurfaces are ultrathin metamaterials constructed by planar meta-atoms with tailored electromagnetic responses. They have attracted tremendous attention owing to their ability to fre

Metasurfaces are ultrathin metamaterials constructed by planar meta-atoms with tailored electromagnetic responses. They have attracted tremendous attention owing to their ability to freely control the propagation of electromagnetic waves. With active elements incorporated into metasurface designs, one can realize tunable and reconfigurable metadevices with functionalities controlled by external stimuli, opening up a new platform to dynamically manipulate electromagnetic waves. In this article, we review the recent progress on tunable and reconfigurable metasurfaces, focusing on their operation principles and practical applications. We describe the approaches to the engineering of reconfigurable metasurfaces categorized into different classes based on the available active materials or elements, which can offer uniform manipulations of electromagnetic waves. We further summarize the recent achievements on programmable metasurfaces with constitutional meta-atoms locally tuned by external stimuli, which can dynamically control the wavefronts of electromagnetic waves. Finally, we discuss time-modulated metasurfaces, which are meaningful to exploit the temporal dimension by applying a dynamic switching of the coding sequence. The review is concluded by our outlook on possible future directions and existing challenges in this fast developing field.show less

• May.29，2022
• Chinese Optics Letters,Vol. 20, Issue 10
• (2022)

We experimentally built a photonics-aided long-distance large-capacity millimeter-wave (mm-wave) wireless transmission system and demonstrated a delivery of 40-Gbit/s W-Band 16-ary quad

We experimentally built a photonics-aided long-distance large-capacity millimeter-wave (mm-wave) wireless transmission system and demonstrated a delivery of 40-Gbit/s W-Band 16-ary quadrature amplitude modulation (QAM) signal over 4600-m wireless distance at 88.5GHz. Advanced offline digital signal processing (DSP) algorithms are proposed and employed for signal recovery, which makes the bit-error ratio (BER) under 2.4×10-2. To our best knowledge, this is the first field-trial demonstration of >4-km W-band 16QAM signal transmission, and the result achieves a record-breaking product of wireless transmission capacity and distance, i.e., 184-Gbit/s·km, for high-speed and long-distance W-band wireless communication. show less

• May.29，2022
• Chinese Optics Letters,Vol. 20, Issue 10
• (2022)

We design and fabricate an unbalanced Mach-Zehnder interferometer (MZI) via electron beam lithography and inductively coupled plasma etching on lithium niobate thin film. ,The single un

We design and fabricate an unbalanced Mach-Zehnder interferometer (MZI) via electron beam lithography and inductively coupled plasma etching on lithium niobate thin film. ,The single unbalanced MZI exhibits a maximum extinction ratio of 32.4 dB and a low extra loss of 1.14 dB at the telecommunication band. Furthermore, tunability of the unbalanced MZI by harnessing the thermo-optic and electro-optic effect is investigated, achieving a linear tuning efficiency of 42.8 pm/℃ and 55.2 pm/V, respectively. The demonstrated structure has applications for sensing and filtering in photonic integrated circuits. show less

• May.29，2022
• Chinese Optics Letters,Vol. 20, Issue 10
• (2022)
Xi'an, ChinaAug 7-10, 2022
Hangzhou, ChinaJuly 14-16, 2022
The image on the cover for Chinese Optics Letters Volume 20, Issue 5, reports reflective photon nanosieves that consist of metallic meta-mirrors sitting on a transparent quartz substrate. Upon illumination, these meta-mirrors offer the reflectance of &sim;50%, which is higher than the transmission of visible light through diameter-identical nanoholes.The image is based on original research by Samia Osman Hamid Mohammed et al. presented in their paper "Efficiency-enhanced reflective nanosieve holograms", Chinese Optics Letters 20 (5), 053602. (2022)
• Journal
• 27th May，2022
The image on the cover for Photonics Research Volume 10, Issue 4, reports the demonstration of an N-polar InGaN/GaN nanowire sub-microscale LED emitting in the red spectrum that can overcome the efficiency cliff of conventional red-emitting micro-LEDs. The image is based on original research by A. Pandey et al. presented in their paper "N-polar InGaN/GaN nanowires: overcoming the efficiency cliff of red-emitting micro-LEDs", Photonics Research 10 (4), 04001107 (2022).
• Journal
• 27th May，2022