Polarization insensitive tunable terahertz coding metasurface based on vanadium dioxide

Zailin Wang; Pengzhan Li; Jinyu Chen; Wanlin Liang; Zhanyi Wu; Qingli Zhou; Cunlin Zhang

doi:10.1117/12.2642057

16 December 2022 Polarization insensitive tunable terahertz coding metasurface based on vanadium dioxide

Zailin Wang, Pengzhan Li, Jinyu Chen, Wanlin Liang, Zhanyi Wu, Qingli Zhou, Cunlin Zhang

Proceedings Volume 12324, Infrared, Millimeter-Wave, and Terahertz Technologies IX; 123240S (2022) https://doi.org/10.1117/12.2642057
Event: SPIE/COS Photonics Asia, 2022, Online Only

Conference Poster

Abstract

Coding metasurface has attracted much attention due to its flexible design of coding sequences and powerful control ability of light beams. However, the traditional coding metasurfaces with pin-diode switches between two metallic patches are usually used in the microwave band. Few studies have been carried out in the terahertz (THz) region with tunable metastructures. In order to realize the dynamic modulation of terahertz metasurface, in this paper we use the phase change material vanadium dioxide (VO2) to activate modulation coding metasurface in the terahertz band. We designed a VO2 embedded hybrid structure with metallic patches as the metasurface unit, which can produce a 180- degree phase change near 0.69 THz during the phase transition of VO2 from an insulating state to the metallic state. Meanwhile, we have constructed a metasurface array with the above designed tunable VO2 components and non-tunable metallic units to realize the dynamic switching of the far-field beam at that frequency. Our simulated results indicate that when the VO2 conductivity increases from 200 to 200000 S/m, the far-field reflected beams of the metasurface array can change from the separation of about 41° apart to close together. Notably, this coding metasurface will remain the reflectivity higher than 0.76 at the working frequency and exhibit polarization insensitive feature to the incident light. The active coding metasurface we designed provides a new idea for flexible beam control and has broad application prospects in terahertz functional devices.

Citation Download Citation

Zailin Wang, Pengzhan Li, Jinyu Chen, Wanlin Liang, Zhanyi Wu, Qingli Zhou, and Cunlin Zhang "Polarization insensitive tunable terahertz coding metasurface based on vanadium dioxide", Proc. SPIE 12324, Infrared, Millimeter-Wave, and Terahertz Technologies IX, 123240S (16 December 2022); https://doi.org/10.1117/12.2642057

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available