论文标题
在穿孔的介电微球中通过共振能量回流辅助的增强的光学陷阱
Enhanced optical trapping assisted by resonant energy backflow in a perforated dielectric microsphere
论文作者
论文摘要
暴露于光波的电介质微球内的光流通常与其波矢量共同指导。同时，如果微颗粒中的光场与高质量的空间本本特征模式（称为窃窃私语模式（WGM））共振，则至少两个反向能流的区域在照明和阴影粒子半球中出现。这些区域具有相当大的实际兴趣，因为它们增强了光学诱捕电位，前提是应从粒子材料中清除。在本文中，我们考虑了一个穿孔的微球，该微球沿着颗粒直径构成空气填充的针孔，理论上分析了WGMS激发的条件。针孔分离了WGM的能量回流区域，并增强了将穿孔的微球转化为有效的光学镊子的光学引进力，以捕获各种纳米对象。
Optical energy flow inside a dielectric microsphere exposed to an optical wave is usually codirected with its wave vector. At the same time, if the optical field in a microparticle is in resonance with a high-quality spatial eigenmode, referred to as the whispering-gallery mode (WGM), at least two regions of reverse energy flow emerge in the illuminated and shadow particle hemispheres. These areas are of considerable practical interest due to their enhanced optical trapping potential provided they should be previously cleared from particle material. In this paper, we consider a perforated microsphere with an air-filled pinhole fabricated along the particle diameter and theoretically analyze the conditions for WGMs excitation. A pinhole isolates the energy backflow regions of WGM and multiple enhances the optical pull-in force that transforms a perforated microsphere into an efficient optical tweezer for trapping various nanoobjects.
