期刊
OPTICS EXPRESS
卷 28, 期 12, 页码 17434-17448出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.394784
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资金
- National Natural Science Foundation of China [61875106, 61775123]
- Key Research and Development Program of Shandong Province [2019GGX104039, 2019GGX104053]
- Shandong University of Science and Technology Top-Notch Talent Project for Young Teachers [BJRC20160505]
- Shandong Graduate Student Tutor Guidance Ability Promotion Program Project [SDYY17030]
- National Key Research and Development Program of China [2017YFA0701000]
A tunable bifunctional terahertz (THz) metamaterial device based on Dirac semimetal films (DSFs) and VO2 is presented. The insulator-to-metal phase transition of VO2 enables bifunctional asymmetric transmission and dual-directional absorption to be switched in the THz range. When VO2 serves as a dielectric, tunable broadband asymmetric transmission of linearly polarized THz waves can be achieved. When VO2 is in a metallic state, the proposed device acts as a tunable dual-directional absorber with perfect absorption in both illumination directions. In each case, the response can be tuned by varying the Fermi energy of the DSFs. This offers a new pathway for the development of tunable multifunctional THz metamaterial devices. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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