Direct Sensing in Liquids Using Whispering-Gallery-Mode Droplet Resonators
Direct Sensing in Liquids Using Whispering-Gallery-Mode Droplet Resonators
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DOI：
10.1002/adom.201400322
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发表时间：
2014-12-01
影响因子：
9
通讯作者：
Gagliardi, Gianluca
中科院分区：
文献类型：
--
作者：
Avino, Saverio;Krause, Anika;Gagliardi, Gianluca
由于表面张力的作用，悬浮在细线、玻璃毛细管或针尖端的液滴形成高Q光学谐振器。在重力平衡条件下，对于石蜡油（体积类似于0.5 μ L），使用例如厚度为250 μ m的二氧化硅纤维，最大液滴直径约为1.5 mm。回音壁模式是由一个自由空间的近红外激光器，是频率锁定到腔共振激发。液滴腔作为一个微型实验室，用于检测化学物质和颗粒。
Liquid droplets suspended by the tip of a thin wire, a glass capillary, or a needle form high-Q optical resonators, thanks to surface tension. Under gravity equilibrium conditions, the maximum drop diameter is approximately 1.5 mm for paraffin oil (volume similar to 0.5 mu L) using, for instance, a silica fiber with 250 mu m thickness. Whispering gallery modes are excited by a free-space near-infrared laser that is frequency locked to the cavity resonance. The droplet cavity serves as a miniature laboratory for sensing of chemical species and particles.