Multifunctional terahertz absorber based on the Dirac semimetal and vanadium dioxide

被引：13
作者：
Zhang, Yong Gang [1 ]
Zhang, R. U., I [1 ]
Liang, Lan Ju [2 ]
Yao, Hai Yun [2 ]
Yan, Xin [3 ]
Huang, Cheng Cheng [1 ]
Ying, Ke Hao [1 ]
机构：
[1] Anhui Univ Sci & Technol, Sch Elect & Informat Engn, Huainan 232001, Anhui, Peoples R China
[2] Zaozhuang Univ, Sch Optoelect Engn, Zaozhuang 277160, Peoples R China
[3] Zaozhuang Univ, Sch Informat Sci & Engn, Zaozhuang 277160, Peoples R China
来源：
APPLIED OPTICS | 2023年 / 62卷 / 03期
基金：
中国国家自然科学基金;
关键词：
PLASMON-INDUCED TRANSPARENCY; PERFECT ABSORBER; REFRACTIVE-INDEX; METAMATERIALS;
D O I：
10.1364/AO.478846
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this paper, a multifunctional terahertz (THz) absorber based on Dirac semimetal and vanadium dioxide (VO2) is proposed. By modulating the temperature of VO2, the absorber can be switched between the narrow band and wide band. When VO2 is in the metallic state, the absorber has a broadband absorption effect with a bandwidth of approximately 4 THz. It has the advantages of insensitivity to polarization and wide-angle absorption. When VO2 is in the insulating state, the absorber has two absorption peaks with absorptivity exceeding 90% and sensitivities of 297.7 and 402 GHz/RIU, and thus can be used as a highly sensitive sensor for cell detection. When the Fermi level of the Dirac semimetal is changed, the absorption characteristics can be modulated. The absorber has broad applica-tion prospects in multifunctional modulated devices. (c) 2023 Optica Publishing Group
引用
收藏
页码：813 / 819
页数：7
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