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Design of Metasurface with Nanoslits on Elliptical Curves for Generation of Dual-Channel Vector Beams

Authors :
Xiaorong Ren
Manna Gu
Xiangyu Zeng
Rui Sun
Yuqin Zhang
Zijun Zhan
Lianmeng Li
Dawei Li
Hong Ma
Chuanfu Cheng
Chunxiang Liu
Source :
Nanomaterials, Vol 11, Iss 11, p 3024 (2021)
Publication Year :
2021
Publisher :
MDPI AG, 2021.

Abstract

The manipulations of nanoscale multi-channel vector beams (VBs) by metasurfaces hold potential applications in various important fields. In this paper, the metasurface with two sets of nanoslits arranged on elliptic curves was proposed to generate the dual-channel focused vector beams (FVBs). Each set of nanoslits was composed of the in-phase and the out-of-phase groups of nanoslits to introduce the constructive interference and destructive interference of the output light field of the nanoslits, focusing the converted spin component and eliminating the incident spin component at the focal point. The two sets of nanoslits for the channels at the two focal points were interleaved on the same ellipses, and by setting their parameters independently, the FVBs in the two channels are generated under illumination of linearly polarized light, while their orders and polarization states of FVBs were controlled independently. The generation of the FVBs with the designed metasurfaces was demonstrated by the finite-difference time domain (FDTD) simulations and by the experimental verifications. The work in this paper is of great significance for the generation of miniaturized multi-channel VBs and for broadening the applications of metasurfaces.

Details

Language :
English
ISSN :
20794991
Volume :
11
Issue :
11
Database :
Directory of Open Access Journals
Journal :
Nanomaterials
Publication Type :
Academic Journal
Accession number :
edsdoj.5525b91316d04bcfaebd0f071ba4cec1
Document Type :
article
Full Text :
https://doi.org/10.3390/nano11113024