Bi-channel near-and far-field optical vortex generator based on a single plasmonic metasurface

• 作者: BENFENG BAI Bo SHEN BOWEN DU BOWEN LI FENG LIN HAN ZHANG HONGBO SUN JIA WANG JING LI LIFENG TIAN LIN SUN QIAO JIANG ToNG CUI XING ZHU YANJUN BAO ZHEYU FANG
• 来源期刊: 光子学研究:英文版
• 学科: 物理学
• 关键词: VORTEX GENERATOR GENERATING
• 年，卷（期）: 2020,（6）
• 页码范围: 986-994
• 页数: 9页
• 分类号: O43

摘要

With the recent development of the metasurface,generating an optical vortex in optical far or near fields is realized in various ways.However,to generate vortices in both the near and far fields simultaneously is still a challenge,although it has great potential in the future compact and versatile photonic system.Here,a bi-channel optical vortex generator in both the near and far fields is proposed and demonstrated within a single metasurface,where the surface plasmon vortex and the far-field optical vortex can be simultancously generated under circularly polarized light.The ability of generating vortices with arbitrary topological charges is experimentally demon-strated,which agrces well with simulations.This approach provides great freedom to integrate different vortex generators in a single device and ofers new opprtunities for integrated optical communications,trapping,and other related fields.