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Owing to the large storage capacity, the transparent luminescent glass with photo‐induced coloration properties has attracted considerable interest in recent years. However, lots of the photochromic (PC) mechanisms for glass are related to the ionic valence transformation, and the study associated with the defects‐induced photochromism of glass is limited. Herein, a kind of Sm3+ doped PC cadmium glass...
Multifrequency and Multimode Topological Transmission
The multifrequency and multimode topological waveguide, utilizing Stampfli‐triangle photonic crystals engineered with large valley Chern numbers, is theoretically and experimentally observed by Bei Yan, Yiwei Peng, Jianjun Liu, Fei Gao, Shuangchun Wen, and their co‐workers (see article number 2300686). There are two topological edge states (TESs)...
Sensitive mid‐infrared (MIR) spectroscopy is highly demanded in various fields ranging from industrial inspection, biomedical diagnosis to astronomical observation. However, the detection sensitivity of conventional MIR spectrometers is severely limited by excessive noises for existing infrared sensors, which hinders widespread use in photon‐scarce scenarios. Here, a broadband MIR single‐photon time‐stretch...