Chinese Optics Letters, 2021, 19 (10): 102602, Published Online: Aug. 16, 2021
Donut-like photonic nanojet with reverse energy flow Download: 532次
Abstract
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.
Hao Wang, Jingjing Hao, Baifu Zhang, Cheng Han, Chunguang Zhao, Zhe Shen, Ji Xu, Jianping Ding. Donut-like photonic nanojet with reverse energy flow[J]. Chinese Optics Letters, 2021, 19(10): 102602.