Donut-like photonic nanojet with reverse energy flow

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作   者：

王浩;  郝晶晶;  张柏富;  韩成;  赵春光;  沈哲;  许吉;  丁剑平; 

作者机构：

College of Electronic and Optical Engineering & College of Microelectronics;  School of Electronic and Optical Engineering;  The 28th Research Institute of China Electronics Technology Group Corporation;  Collaborative Innovation Center of Advanced Microstructures and School of Physics; 

期刊名称：

中国光学快报(英文版)

基金项目：

三维矢量光场的生成、调控、效应及应用的研究

i s s n：

1671-7694

年卷期：

2021 年 010 期

页   码：

92-96

摘   要：

Photonic nanojets（PNJs） are subwavelength jet-like propagating waves generated by illuminating a dielectric microstructure with an electromagnetic wave, conventionally a linearly polarized plane wave. Here, we study the donut-like PNJ produced when a circularly polarized vortex beam is used instead. This novel PNJ also has a reverse energy flow at the donut-like focal plane depending on both the optical vortex topological charge and microsphere size. Our tunable PNJ, which we investigate numerically and analytically, can find applications in optical micromanipulation and trapping.