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- 摘要
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- 实验方案
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Thermally tunable and electrically switchable solid sphere shell three-layer 3D Bragg microcavity laser based on cholesteric-liquid-crystals
摘要： This letter reports a thermally tunable and electrically switchable three-layer 3D Bragg resonance cavity consisting of dye-doped cholesteric-liquid-crystal (DDCLC) microdroplet, polyglycerol-2 and hollow-glass-microsphere (HGM). The whispering-gallery-mode and photonic bandgap mode can be controlled by varying the CLC refractive indices in HGM. The effects of the temperature and electric field on the peaks wavelengths were studied. The study results present the prospect of thermally and electrically controlled the output mode of the microlaser and such solid shell tunable DDCLC microsphere lasers have an outstanding potential applications in integrated microlasers, tunable optical devices and highly sensitive sensor.
关键词： thermally tunable,cholesteric-liquid-crystals,electrically switchable,3D Bragg microcavity,microlaser
更新于2025-09-11 14:15:04
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Observation of scalable sub-Poissonian-field lasing in a microlaser
摘要： Sub-Poisson field with much reduced fluctuations in a cavity can boost quantum precision measurements via cavity-enhanced light-matter interactions. Strong coupling between an atom and a cavity mode has been utilized to generate highly sub-Poisson fields. However, a macroscopic number of optical intracavity photons with more than 3 dB variance reduction has not been possible. Here, we report sub-Poisson field lasing in a microlaser operating with hundreds of atoms with well-regulated atom-cavity coupling and interaction time. Its photon-number variance was 4 dB below the standard quantum limit while the intracavity mean photon number scalable up to 600. The highly sub-Poisson photon statistics were not deteriorated by simultaneous interaction of a large number of atoms. Our finding suggests an effective pathway to widely scalable near-Fock-state lasing at the macroscopic scale.
关键词： microlaser,Sub-Poissonian-field lasing,cavity-enhanced light-matter interactions,quantum precision measurements,macroscopic sub-Poissonian field stabilization
更新于2025-09-11 14:15:04
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Near-Infrared Microlasers from Self-assembled Spiropyrane-Based Microsphercial Caps
摘要： Near-infrared (NIR) microlasers play a significant role in telecommunication and biomedical tissue imaging. However, it remains a big challenge to realize NIR microlasers due to the difficulty in preparing highly efficient NIR luminescent materials and perfect optical resonators. Here we propose a molecular design strategy to creatively realize the first spiropyrane-based NIR microlasers with low threshold from self-assembled microsphercial caps. Tetraphenylethylene (TPE) moiety with a highly twisted conformation provides a large free volume to facilitate the photoisomerization process of spiropyrane (SP) and enhance NIR emission of merocyanine in the solid state. Moreover, self-assembled TPE-SP microsphercial caps simultaneously serve as gain media and resonating microcavities, providing optical gain and feedback for NIR laser oscillations with a low threshold (3.68 μJ/cm2). These results are beneficial for deeply understanding the SP microstructures-lasing emission characteristic relationship and provide a useful guideline for the rational molecular design of NIR microlasers with special functionalities.
关键词： tetraphenylethylene twisted conformation,spiropyrane,enhanced quantum yield,self-assembled microsphercial cap,NIR microlaser
更新于2025-09-11 14:15:04