Bidirectional switchable metalens based on phase change materials of GST

Metalens can achieve more challenging functions especially dynamic regulation than traditional lens due to its unprecedented ability to manipulate light. In this paper, an approach to realizing switchable bidirectional metalens is proposed based on phase change material GST. Two geometric parameters...

Full description

Saved in:
Bibliographic Details
Published in:IEEE photonics journal 2023-08, Vol.15 (4), p.1-6
Main Authors: Li, Yuke, Chen, Yuxuan, Liu, Zexu, Lou, Yipan, Lian, Yi, Jiang, Chang, Wang, Jicheng, Li, Xianqin
Format: Article
Language:English
Subjects:
Bilayers
Metasurface
Metasurfaces
Microscopes
multi- dimensional focus
Optical imaging
Optical microscopes
Optical polarization
Optical refraction
Optical switches
Optical variables control
Phase change materials
Phase distribution
Phase modulation
Phase transitions
Substrates
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Metalens can achieve more challenging functions especially dynamic regulation than traditional lens due to its unprecedented ability to manipulate light. In this paper, an approach to realizing switchable bidirectional metalens is proposed based on phase change material GST. Two geometric parameters of nanopillars were designed to demonstrate full phase modulation due to the Pancharatnam-Berry phase. According to the phase distribution, we realize the flexible control of the metalens through the transition of states. These special designs of unit structures make multi-focal point focus and two-dimensional focus also realized. In addition, the bidirectional switchable metalens have been realized through the transformation of states on a bilayer metasurface substrate. Its unique phase transition properties which are not available to previous metasurface can be applied in high quality imaging cameras, optical microscopes, lidar scanning systems, etc.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2023.3295595