Author(s): Zhuang, LY (Zhuang, Lingyun); Zhang, WJ (Zhang, Wenjing); Liu, JT (Liu, Jietao); Chao, MH (Chao, Minghao); Liu, QS (Liu, Qingsong); Cheng, B (Cheng, Bo); Xu, Y (Xu, Yun); Song, GF (Song, Guofeng)

Source: OPTICS EXPRESS Volume: 30 Issue: 25 Pages: 45848-45861 DOI: 10.1364/OE.476527 Published: DEC 5 2022

Abstract: In this paper, we proposed a multilayer terahertz absorber composed of hybrid graphene and vanadium dioxide (VO2). Based on electrical controlling of graphene and thermal tuning of VO2 , three different switchable absorption states are achieved in one structure. When VO2 is in the metal phase and the Fermi level of graphene is set as 0eV , high-frequency broadband (bandwidth, 5.45THz) absorption from 4.5 to 9.95THz is demonstrated. While VO2 is switched to the insulator state, absorption states depend on the Fermi energy of graphene. As the Fermi level changes from 1eV to 0eV , the absorption can be switched from low-frequency broadband (bandwidth, 2.86THz) to dual-frequency absorption. The effect of geometric parameters and fabrication tolerance on the robustness of the absorption properties is explored. The proposed absorber has three switchable states through modulation of graphene and VO2 , which is expected to realize potential applications in modulating, filtering, detecting, and other fields.(c) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Accession Number: WOS:000914933300004

PubMed ID: 36522980

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

Chao, Minghao                  0000-0002-0246-041X

Liu, Jietao                  0000-0002-1156-9775

ISSN: 1094-4087

Full Text: https://opg.optica.org/oe/fulltext.cfm?uri=oe-30-25-45848&id=522202