Near-infrared doublet zoom lens based on Ge 2 Sb 2 Te 5 metasurface

Although numerous studies showcase the capability of metalenses to serve as crucial elements of miniaturized optical systems, tunable focusing remains an ongoing challenge. Here, we propose a doublet zoom lens based on a Ge 2 Sb 2 Te 5 (GST) metasurface at a wavelength of 1.55 μ m. Multistep zooming...

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Bibliographic Details
Published in:Journal of optics (2010) 2022-05, Vol.24 (5), p.55101
Main Authors: Yang, Lei, Zhang, Minjie, Yang, Xiaohui, Liu, Yu, Ren, Xudong, Zhang, Yun, Chen, Mingyang, Ren, Yunpeng, Ye, Yunxia
Format: Article
Language:English
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Summary:Although numerous studies showcase the capability of metalenses to serve as crucial elements of miniaturized optical systems, tunable focusing remains an ongoing challenge. Here, we propose a doublet zoom lens based on a Ge 2 Sb 2 Te 5 (GST) metasurface at a wavelength of 1.55 μ m. Multistep zooming is realized by the joint control of incident circular polarization inversion and GST phase transition. Three tight focal spots, 0.91 λ , 1.09 λ and 0.89 λ, are achieved from the composite lens. The devised highly-integrated doublet lens, with advantages such as as being multi-foci, easily operated and responding quickly, can find applications in fields that require ultracompact zoom imaging and beam focusing.
ISSN:2040-8978
2040-8986
DOI:10.1088/2040-8986/ac55da