Affiliation:
1. China Jiliang University
2. Zhejiang University of Technology
Abstract
We propose a difunctional tunable broadband absorber/reflector consisting of a periodic cross-shaped graphene array and a vanadium dioxide (
V
O
2
) layer. When
V
O
2
reflects the properties of metal, the proposed dual-function device is used as a reflector; when
V
O
2
reflects the nature of the dielectric, the difunctional device will be used as an absorber. The simulation results indicate that more than 90% absorption bandwidth can be available in the absorber in the frequency range of 56.1–59.0 THz, up to 100%. Moreover, over 80% absorption can be achieved over the frequency range of 88.5 to 90.2 THz. In addition, the bandwidth and absorption of the metamaterial absorber can be dynamically changed because of the Fermi energy level in graphene and the temperature tunability of
V
O
2
. The proposed device can be applied to manufacturing infrared spectrophotometers, on-dispersive infrared photometers, and Fourier transform infrared spectrometers. Therefore, it has potential application in the field of environmental monitoring.
Funder
Natural Science Foundation of Zhejiang Province
2020 Zhejiang University Student Science and Technology Innovation Activity Plan and New Miao Talent Plan Project
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
Cited by
15 articles.
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