Graphene-based terahertz bias-driven negative-conductivity metasurface

Guibin Li; Guocui Wang; Jingling Shen; Bo Zhang; Yan Zhang

doi:10.1117/12.2687607

26 November 2023 Graphene-based terahertz bias-driven negative-conductivity metasurface

Guibin Li, Guocui Wang, Jingling Shen, Bo Zhang, Yan Zhang

Proceedings Volume 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X; 1277614 (2023) https://doi.org/10.1117/12.2687607
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Conference Poster

Abstract

Graphene-based terahertz (THz) negative-conductivity metasurfaces based on two types of unit cell structures are investigated under the control of an external bias voltage. Electrical characterization is conducted and verification is performed using the finite-difference time-domain simulation and an optical-pump THz-probe system in terms of simulation and transient response analysis. Owing to the metal-like properties of graphene, the strong interaction between the metasurface and monolayer graphene yields a short-circuit effect, which considerably weakens the intensity of the resonance mode under passive conditions. Under active conditions, graphene, as an active load, actively induces a negative-conductivity effect, which enhances the THz transmission and recovers the resonance intensity gradually because of the weakening of short-circuit effect. The resulting resonance frequency shows a blue shift. This work provides a reference value for combining the bias-driven negative-conductivity graphene with metasurfaces and points the corresponding applications in the future.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Guibin Li, Guocui Wang, Jingling Shen, Bo Zhang, and Yan Zhang "Graphene-based terahertz bias-driven negative-conductivity metasurface", Proc. SPIE 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X, 1277614 (26 November 2023); https://doi.org/10.1117/12.2687607

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