Donut-like photonic nanojet with reverse energy flow

• 作者: Hao Wang Jingjing Hao Baifu Zhang Cheng Han Chunguang Zhao Zhe Shen Ji Xu Jianping Ding
• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2021,（10）
• 所属期刊栏目: Physical Optics
• 页码范围: 88-92
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL202119.102602

摘要

Photonic nanojets[PNJs]are subwavelength jet-like propagating waves generated by illuminating a dielectric microstruc-ture 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.