Terahertz Reconfigurable Metasurface for Dynamic Non-Diffractive Orbital Angular Momentum Beams using Vanadium Dioxide

• Main Authors: Ling Wang, Yang Yang, Shufang Li, Li Deng, Weijun Hong, Chen Zhang, Jianfeng Zhu, David McGloin
• Format: Article
• Language: English
• Published: IEEE 2020-01-01
• Series: IEEE Photonics Journal
• Subjects: Terahertz (THz); reconfigurable metasurface; vanadium dioxide (<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX">$\text{VO}_{2}$</tex-math> </inline-formula> </named-content>); orbital angular momentum (OAM); topological charge (TC); non-diffractive beam
• Online Access: https://ieeexplore.ieee.org/document/9112165/

Orbital angular momentum (OAM) generation based on metasurfaces has attracted tremendous interest due to its potential in capacity enhancement of high-speed wireless communication systems. Reconfigurability is one of the key desired characteristics for the design of future metasurfaces. In this paper, a metasurface taking advantage of vanadium dioxide (VO₂) is proposed. The proposed design can generate a non-diffractive OAM beam and achieve the multiple reconfigurability of the topological charge, beam radius, beam deflection angle. The operation frequency can be adjusted by controlling the state of VO₂ at terahertz (THz) region. Simulation results demonstrate that the designed metasurface can generate a non-diffractive OAM beam with tunable topological charge and beam radius, propagating along &#x00B1;x or &#x00B1;y directions with the controllable deflection angle between 6.74&#x00B0; and 44.77&#x00B0;, ranging from 0.69 THz to 0.79 THz.