基于狄拉克半金属和二氧化钒的三频段双调谐吸波体
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1.云南农业大学;2.云南大学

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基金项目:

国家自然科学基金(61461052, 11564044, 61863035);云南省科技厅农业联合专项(202101BD070001-064);云南农业大学一流课程课题(2021YLKC114)


Dual-tunable triple-band absorber based on bulk Dirac semimetal and vanadium dioxide
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Affiliation:

1.Yunnan Agricultural University;2.Yunnan University

Fund Project:

National Natural Science Foundation of China (NSFC) (Grant Nos. 61461052, 11564044, and 61863035). Yunnan Provincial Department of Science and Technology Agricultural Joint Special Project(Grant Nos. 202101BD070001-064) and Yunnan Agricultural University offline first-class undergraduate courses (Grant Nos. 2021YLKC114)

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    摘要:

    提出了基于狄拉克半金属(BDS)和二氧化钒(VO2)的三频段双调谐吸波体,通过时域有限差分法和等效电路模型(ECM)分析了吸波体的电磁特性。研究表明:当VO2呈现出纯金属态时,吸波体会出现三个明显的吸收峰,平均吸收率为98.64%。同时,通过改变BDS费米能量和VO2电导率可以动态调谐吸波体吸收峰处的谐振频率和吸收率。最后,分别讨论了吸波体吸波特性随BDS层、VO2层和中间介质层厚度的变化规律。这为多带双调谐滤波器、吸波体的设计提供了理论依据。

    Abstract:

    In this paper, a dual-tunable triple-band absorber based on bulk Dirac semimetal (BDS) and vanadium dioxide (VO2) is proposed. The electromagnetic properties of the absorber were analyzed by the finite difference time domain method and equivalent circuit model (ECM). When the VO2 is in fully metallic state, the absorption spectrum of the dual-tunable absorber exhibits three obvious absorption peaks with the average absorptance is 98.64%. The resonant frequencies and absorptivity of the absorber can be dynamically controlled by adjusting the Fermi energies of BDS and the conductivities of VO2. Finally, the relationships between the absorptivity of the dual-tunable absorber and the different thicknesses of the BDS, VO2 and immediate dielectric layers are further discussed. This work provides potential applications in the designs of multi-band dual-tunable filters and absorbers.

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  • 收稿日期:2022-08-02
  • 最后修改日期:2022-09-02
  • 录用日期:2022-09-05
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