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 ∼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–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).

The image on the cover for Chinese Optics Letters Volume 20, Issue 2, proposes a ring-shaped focus with controllable gaps by multiplexing the vortex beam and annular beam. The multiplexed beam has several advantages, such as the diameter and flow energy of the focal point can be individually controlled and are not affected by the zero-order beam, and the gap size and position are controllable.The image is based on original research by Chenchu Zhang et al. presented in their paper "Rapid fabrication of microrings with complex cross section using annular vortex beams", Chinese Optics Letters 20 (2), 023801 (2022).

The image on the cover for Chinese Optics Letters Volume 20, Issue 1, demonstrates integrated lithium niobate (LN) microring resonators with QQ factors close to the intrinsic material absorption limit of LN. The microrings are fabricated on pristine LN thin-film wafers thinned from LN bulk via chemo-mechanical etching without ion slicing and ion etching. The image is based on original research by Renhong Gao et al. presented in their paper "Lithium niobate microring with ultra-high Q factor above 10⁸ ", Chinese Optics Letters 20 (1), 011902 (2022).