基于回音壁模式和光子带隙模式激光发射的可调谐液晶微壳激光器。

Tunable liquid-crystal microshell-laser based on whispering-gallery modes and photonic band-gap mode lasing.

作者信息

Lu Yuelan, Yang Yue, Wang Yan, Wang Lei, Ma Ji, Zhang Lingli, Sun Weimin, Liu Yongjun

出版信息

Opt Express. 2018 Feb 5;26(3):3277-3285. doi: 10.1364/OE.26.003277.

DOI:10.1364/OE.26.003277

Abstract

The lasing behaviors of dye-doped cholesteric liquid crystal (DDCLC) microshells fabricated with silica-glass-microsphere coated DDCLCs were examined. Lasing characteristics were studied in a carrier medium with different refractive indices. The lasing in spherical cholesteric liquid crystals (CLCs) was attributed to two mechanisms, photonic band-gap (PBG) lasing and whispering-gallery modes (WGMs), which can independently exist by varying the chiral agent concentration and pumping energy. It was also found that DDCLC microshells can function as highly sensitive thermal sensors, with a temperature sensitivity of 0.982 nm °C in PBG modes and 0.156 nm °C in WGMs.

摘要

研究了用涂覆有二氧化硅玻璃微球的掺杂染料胆甾相液晶（DDCLC）制备的DDCLC微壳的激光行为。在具有不同折射率的载液中研究了激光特性。球形胆甾相液晶（CLC）中的激光归因于两种机制，即光子带隙（PBG）激光和回音壁模式（WGM），通过改变手性剂浓度和泵浦能量，它们可以独立存在。还发现DDCLC微壳可以用作高灵敏度热传感器，在PBG模式下温度灵敏度为0.982 nm/°C，在WGM模式下为0.156 nm/°C。