Tunable whispering gallery modes lasing in dye-doped cholesteric liquid crystal microdroplets
Tunable whispering gallery modes lasing in dye-doped cholesteric liquid crystal microdroplets
复制标题
染料掺杂胆甾型液晶微滴中可调谐回音壁模式激光发射
DOI：
10.1063/1.4971973
复制
发表时间：
2016-12-05
影响因子：
4
通讯作者：
Yang, Jun
中科院分区：
文献类型：
--
作者：
Wang, Yan;Li, Hanyang;Yang, Jun
本文报道了在不混溶的水环境中，观察到染料掺杂的胆甾型液晶(CLCs)乳状液微滴的光泵浦WGM激光发射。浸没液体与CLC微滴之间较高的折射率对比度有助于产生WGM共振，从而在CLC微滴中通过全内反射实现激光发射。数值模拟和激光尺寸效应实验验证了WGM的激光特性。激光波长取决于CLC微滴的折射率，并且可以通过改变温度来调节。在直径为20 m的微滴中，在6 °C温度区间内实现了9.1μnm的调谐范围。这种温度可调的微激光器在柔性光热器件中具有广阔的应用前景。
This paper reports the observation of optically pumped whispering gallery mode (WGM) lasing emission from dye-doped emulsion microdroplets of cholesteric liquid crystals (CLCs) suspended in an immiscible aqueous environment. The higher index contrast between the immersion liquid and CLC microdroplet contributes to the generation of WGM resonance so that lasing emission can be realized in the CLC microdroplet via total internal reflection. The WGM lasing nature is verified by numerical simulations as well as experiment of size-dependent lasing action. The lasing wavelength depends on the refractive index of the CLC microdroplet and can be tuned by varying the temperature. A tuning range of 9.1 nm within 6 °C temperature interval is realized in a 20-μm-diameter microdroplet. Such a temperature tunable microlaser is promising for applications of flexible photothermic devices.