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A multi-band and polarization-independent perfect absorber based on Dirac semimetals circles and semi-ellipses array |
| Zhiyou Li(李治友)1,†, Yingting Yi(易颖婷)3,†, Danyang Xu(徐丹阳)4, Hua Yang(杨华)2, Zao Yi(易早)1,‡, Xifang Chen(陈喜芳)1, Yougen Yi(易有根)3, Jianguo Zhang(张建国)5, and Pinghui Wu(吴平辉)6,§ |
1 Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China;
2 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;
3 College of Physics and Electronics, Central South University, Changsha 410083, China;
4 College of Science, Zhejiang University of Technology, Hangzhou 310023, China;
5 Department of Physics and Electronic Engineering, Jinzhong University, Jinzhong 030619, China;
6 Research Center for Photonic Technology, Key Laboratory of Information Functional Material for Fujian Higher Education, Quanzhou Normal University, Quanzhou 362000, China |
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Abstract We design a four-band terahertz metamaterial absorber that relied on the block Dirac semi-metal (BDS). It is composed of a Dirac material layer, a gold reflecting layer, and a photonic crystal slab (PCS) medium layer. This structure achieved perfect absorption of over 97% at 4.06 THz, 6.15 THz, and 8.16 THz. The high absorption can be explained by the localized surface plasmon resonance (LSPR). And this conclusion can be proved by the detailed design of the surface structure. Moreover, the resonant frequency of the device can be dynamically tuned by changing the Fermi energy of the BDS. Due to the advantages such as high absorption, adjustable resonance, and anti-interference of incident angle and polarization mode, the Dirac semi-metal perfect absorber (DSPA) has great potential value in fields such as biochemical sensing, information communication, and nondestructive detection.
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Received: 23 February 2021
Revised: 05 April 2021
Accepted manuscript online: 26 April 2021
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PACS:
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81.05.Xj
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(Metamaterials for chiral, bianisotropic and other complex media)
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87.50.up
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(Dosimetry/exposure assessment)
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36.20.Kd
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(Electronic structure and spectra)
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11604311, 61705204, and 21506257), the Scientific Research Fund from Sichuan Provincial Science and Technology Department (Grant Nos. 2020YJ0137 and 2020YFG0467), the Undergraduate Innovation Fund by Southwest University of Science and Technology (Grant No. JZ20-027), the Fund by the School of Science of Southwest University of Science and Technology for the Innovation Fund Project (Grant No. LX2020010), and the Undergraduate Innovation and Entrepreneurship Training Program of Southwest University of Science and Technology (Grant No. S202010619073). |
Corresponding Authors:
Zao Yi, Pinghui Wu
E-mail: yizaomy@swust.edu.cn;wph1021@163.com
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Cite this article:
Zhiyou Li(李治友), Yingting Yi(易颖婷), Danyang Xu(徐丹阳), Hua Yang(杨华), Zao Yi(易早), Xifang Chen(陈喜芳), Yougen Yi(易有根), Jianguo Zhang(张建国), and Pinghui Wu(吴平辉) A multi-band and polarization-independent perfect absorber based on Dirac semimetals circles and semi-ellipses array 2021 Chin. Phys. B 30 098102
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