Two bits dual-band switchable terahertz absorber enabled by composite graphene and vanadium dioxide metamaterials

被引:24
作者
Barzegar-Parizi, Saeedeh [1 ]
Ebrahimi, Amir [2 ]
Ghorbani, Kamran [2 ]
机构
[1] Sirjan Univ Technol, Elect Engn Dept, Sirjan, Iran
[2] RMIT Univ, Sch Engn, Melbourne, Australia
关键词
BROAD-BAND; PERFECT ABSORBER; PLASMONICS; DESIGN; RESONANCE; SILICON;
D O I
10.1038/s41598-024-56349-y
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
This article presents the design of a 2-bit dual-band switchable terahertz absorber using a stacked combination of graphene and vanadium dioxide (VO2) metamaterials. For the first time, the proposed absorber design offers four switchable states by controlling the conductivity of graphene and VO2 metamaterial layers. The lower absorption band is produced by the graphene metamaterial, whereas the upper band is implemented by the VO2 metamaterial pattern. The structure shows two absorption bands (State 11) at 0.745-0.775 THz and 2.3-5.63 THz, when the Fermi graphene level of graphene is 0.2 eV and the VO2 is in the metallic phase. The lower absorption band is turned off, while keeping the upper band (State 01), when the graphene Fermi level is 0 eV and the VO2 layer is in the metallic phase. The upper absorption band is turned off, while preserving the lower absorption band (State 10) by switching the VO2 into the insulator phase and keeping the graphene Fermi level at 0.2 eV. Finally, both of the absorption bands are turned off by setting the graphene Fermi level to 0 eV and switching the VO2 into the insulating phase. Equivalent circuit modelling analysis and full-wave electromagnetic simulations are used to explain the operation principle of the proposed absorber. Very good agreement is obtained between the theoretical analysis and the simulations confirming the presented design principle for the 2-bit switchable absorber.
引用
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页数:14
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