Stereo Metasurfaces for Efficient and Broadband Terahertz Polarization Conversion

Yuehong Xu, Quan Xu, Xueqian Zhang, Xi Feng, Yongchang Lu, Xixiang Zhang, Ming Kang, Jiaguang Han, Weili Zhang

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Efficient and flexible manipulation of terahertz (THz) polarization in a broadband manner using metasurfaces has attracted continuous attention in recent years. Previous studies have commonly applied multilayer metallic resonators or bonded dielectric structures as the basic units, which are affected by the spacer loss or bonding difficulty and stability. Here, a new design scheme is proposed based on an all-metal stereo U-shaped meta-atom working in a reflection configuration. The stereo metasurface functions as an efficient and broadband THz waveplate with tailorable birefringence simply controlled by the sunken depth. Such an intriguing property is experimentally verified by a reflection-type THz half-waveplate. The polarization conversion ratio is higher than 90%, with 69% relative bandwidth and over 85° angle tolerance for incidence. Furthermore, an efficient and broadband meta-grating based on the Pancharatnam–Berry phase method is also experimentally demonstrated. The proposed strategy enriches the design degrees of freedom of polarization-related metasurfaces and may find broad applications in realizing various functional devices.
Original languageEnglish (US)
Pages (from-to)2207269
JournalADVANCED FUNCTIONAL MATERIALS
DOIs
StatePublished - Aug 11 2022

Bibliographical note

KAUST Repository Item: Exported on 2022-09-14
Acknowledgements: This work is supported by the National Natural Science Foundation of China (Grant Nos. 62075158, 62005193, 62025504, 61735012, 11974259, 61875150, and 61935015); Tianjin Municipal Fund for Distinguished Young Scholars (grant No. 18JCJQJC45600).

ASJC Scopus subject areas

  • General Chemical Engineering
  • Electronic, Optical and Magnetic Materials

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