The image on the cover for Photonics Research Volume 10, Issue 7, demonstrates an on-chip path encoded photonic quantum Toffoli gate enabled by the 3D capability of the femtosecond laser direct writing (FLDW) for the first time, whose truth-table fidelity is higher than 85.5%. The image is based on original research by Meng Li et al. presented in their paper "On-chip path encoded photonic quantum Toffoli gate", Photonics Research 10 (7), 1533 (2022).

The image on the cover for Chinese Optics Letters Volume 20, Issue 7, presents a simple way to experimentally probe fluorescence quantum efficiency of single dibenzoterrylene molecules embedded in a thin anthracene microcrystal obtained through a co-sublimation process. The image is based on original research by Penglong Ren et al. presented in their paper "Probing fluorescence quantum efficiency of single molecules in an organic matrix by monitoring lifetime change during sublimation", Chinese Optics Letters 20 (7), 073602. (2022)

The image on the cover for Photonics Research Volume 10, Issue 6, proposes a broadband high-efficiency polarization-multiplexing method based on a geometric phase polymerized liquid crystal metasurface to yield the polarization-switchable functionalities in the visible. The image is based on original research by Xinjian Lu et al. presented in their paper "Broadband high-efficiency polymerized liquid crystal metasurfaces with spin-multiplexed functionalities in the visible", Photonics Research 10 (6), 1380 (2022).

The image on the cover for Chinese Optics Letters Volume 20, Issue 6, demonstrate an ultra-compact short-wave infrared (SWIR) multispectral detector chip by monolithically integrating the narrowband Fabry–Perot microcavities array with the InGaAs detector focal plane array. The image is based on original research by Zhiyi Xuan et al. presented in their paper " On-chip short-wave infrared multispectral detector based on integrated Fabry–Perot microcavities array", Chinese Optics Letters 20 (6), 061302. (2022)

AP 2022 brings together international leading researchers, scientists, and engineers who are actively working in biophotonics, laser and nonlinear optics, nanophotonics and optical computing, sensing and imaging, and related areas. This international event is initiated by Advanced Photonics, a highly selective, open-access, international journal that publishes innovative research in all areas of optics and photonics. You will find plenty to like through the 3 days of exciting cutting-edge research, held hybridly onsite/online, offering plenary presentations, invited talks, poster presentation and networking activities.

Three-year-old journal ranked among top optics journals in first year of recognition.

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).