Switchable Terahertz Absorber from Single Broadband to Dual Broadband Based on Graphene and Vanadium Dioxide

被引：18
作者：
Wang, Guan [1 ]
Wu, Tong [1 ]
Jia, Yang [1 ]
Gao, Yang [1 ]
Gao, Yachen [1 ]
机构：
[1] Heilongjiang Univ, Elect Engn Coll, Harbin 150080, Peoples R China
来源：
NANOMATERIALS | 2022年 / 12卷 / 13期
关键词：
terahertz; graphene; vanadium dioxide; impedance matching; absorption; TUNABLE BANDWIDTH; FREQUENCY; MODULATOR; WAVES;
D O I：
10.3390/nano12132172
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A multifunctional switchable terahertz (THz) absorber based on graphene and vanadium dioxide (VO2) is presented. The properties of the absorber are studied theoretically by the finite-difference time-domain (FDTD) method. The results illustrate that the structure switches between the single-broadband or double-broadband absorption depending on the temperature of VO2. Moreover, the amplitude of the absorptivity can be adjusted by changing the Fermi energy level (E-F) of graphene or the conductivity of VO2 separately. Via impedance matching theory, the physical mechanism of the absorber is researched. Furthermore, the effects of incidence angle on absorption have also been studied. It is found that the absorber is insensitive to the polarization of electromagnetic waves.
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页数：9
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