Reconfigurable All Dielectric Metasurfaces based on Optical Phase Change Materials: Design Approaches

Optical metasurface is a recently emerged paradigm for controlling light propagation, which enables implementation of ultra-compact optical devices with extended functionalities. Nowadays the main challenge in the field is to realize active metasurfaces with high quality, high efficiency, and large...

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Bibliographic Details
Published in:Applied Computational Electromagnetics Society journal 2020-11, Vol.35 (11), p.1445-1446
Main Authors: Shalaginov, Mikhail, An, Sensong, Zhang, Yifei, Yang, Fan, Fowler, Clayton, Zhang, Hualiang, Hu, Juejun, Gu, Tian
Format: Article
Language:English
Subjects:
Computer engineering
Efficiency
Libraries
Materials science
Metasurfaces
Optics
Phase change materials
Phase transitions
Photonics
Reconfiguration
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Summary:Optical metasurface is a recently emerged paradigm for controlling light propagation, which enables implementation of ultra-compact optical devices with extended functionalities. Nowadays the main challenge in the field is to realize active metasurfaces with high quality, high efficiency, and large tuning range. Here we present a design approach for constructing a two-state reconfigurable metalens made of low-loss optical phase-change material (O-PCM). The metalens design is capable to produce diffraction limited focusing, large change in focal length (from 1.5 mm to 2mm), and decent focusing efficiency of about 20% in both states. The proposed design methodology is generic and can be easily extended towards constructing metasurfaces, which can switch between two or more arbitrary phase maps.
ISSN:1054-4887
1054-4887
1943-5711
DOI:10.47037/2020.ACES.J.351191