Transmissive terahertz metalens with full phase control based on a dielectric metasurface

Optics Letters
Delin JiaXiaomei Yu

Abstract

In this paper, we report a transmissive terahertz (THz) metalens based on a dielectric metasurface that consists of periodically arranged sub-wavelength silicon cross resonators with a spatially hyperboloidal phase profile. By varying arm lengths of the cross resonators, we obtained a full 2π phase coverage with high transmission at target frequency. The fabricated metalens was experimentally demonstrated to focus a continuous THz beam to a spot with a full width at half-maximum of 630 μm at a focal length of 28 mm, which agrees well with the theoretical calculation. This device has potential for applications in THz imaging and communications, and our work can also easily be extended in the design of other planar THz components, such as beam deflectors or vortex plates.

References

Apr 6, 2007·Optics Letters·E D WalsbyD R S Cumming
Jun 3, 2011·Optics Letters·Agnieszka SiemionJean-Louis Coutaz
Oct 10, 2013·Optics Express·Seung Jae OhJin-Suck Suh
Jan 24, 2014·Nature Materials·Nanfang Yu, Federico Capasso
Jul 1, 2014·Optics Express·Tiaoming NiuChristophe Fumeaux
Jul 19, 2014·Science·Dianmin LinMark L Brongersma
Nov 18, 2014·Optics Express·Quanlong YangWeili Zhang
Jan 15, 2015·Scientific Reports·Sergei A KuznetsovMiguel Navarro-Cía
Oct 21, 2015·Optics Express·Xiaoqiang SuWeili Zhang
Apr 30, 2017·Optics Letters·Chun-Chieh ChangHou-Tong Chen

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Citations

May 3, 2018·Optics Express·Yuxuan Jia
Jun 8, 2018·Optics Express·Xue JiangGang Chen
Jun 6, 2019·Optics Express·Xiaoyong HeWangzhou Shi
Jul 16, 2019·Optics Letters·Ruiqiang ZhaoHan Zhang
Mar 4, 2020·Optics Express·Raghu DharmavarapuShanti Bhattacharya
Jul 8, 2020·Optics Letters·Ruoxing WangXianzhong Chen
Mar 2, 2019·Optics Letters·Simonas IndrišiūnasIrmantas Kašalynas
Sep 11, 2020·Optics Express·Mengmeng LiRushan Chen

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