[1] Liu Hongwei, Chen Qingchao, Sun Meiqi, Lü Junpeng, et al. Photoinduced dynamically tunable terahertz metamaterial absorber [J]. Journal of Southeast University (English Edition), 2024, 40 (2): 148-154. [doi:10.3969/j.issn.1003-7985.2024.02.005]

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Photoinduced dynamically tunable terahertz metamaterial absorber()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

40

Issue:

2024 2

Page:

148-154

Research Field:

Mathematics, Physics, Mechanics

Publishing date:

2024-06-13

Info

Title:

Photoinduced dynamically tunable terahertz metamaterial absorber

Author(s):

Liu Hongwei¹;  Chen Qingchao¹;  Sun Meiqi¹;  Lü Junpeng²

¹ School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China
² School of Physics, Southeast University, Nanjing 211189, China

Keywords:

terahertz;  metamaterial absorber;  photoexcitation;  dynamically tunable

PACS:

O441;TB34

DOI:

10.3969/j.issn.1003-7985.2024.02.005

Abstract:

A photoexcited switchable single-band/dual-band terahertz metamaterial absorber with polarization-insensitive and wide-angle absorption is reported. The function switching is realized by modulating the conductivity of the photosensitive GaAs embedded in the resonator, and the surface currents at different GaAs conductivities are extracted to physically explain the absorption mechanism of the metamaterial absorber. The results show that the absorber can realize switching from dual-band absorption at 0.568 and 1.442 THz with 99.08% and 99.56% absorptivity, respectively, to a shift single-band absorption at 0.731 THz with 95.43% absorptivity. The device has an intensity modulation depth of 61.4% and a frequency tuning bandwidth of 60.6%. With these values, the device can be used to fabricate intensity modulators and frequency-selective absorbers in the terahertz band. In addition, the proposed absorber exhibits polarization-independent and wide-angle absorption for transverse electric(TE)and transverse magnetic(TM)polarization waves. The realization of tunable metamaterial absorbers offers opportunities for mature semiconductor technologies and potential applications in active terahertz modulators and switchers.

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Memo

Memo:

Biography: Liu Hongwei(1986—), female, doctor, professor, phylhw@njnu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No. T2222011, 62174026, 12274234), the National Key Research and Development Program of China(No. 2023YFB3611400, 2019YFA0308000), the Fundamental Research Funds for the Central Universities(No. 242023k30027).
Citation: Liu Hongwei, Chen Qingchao, Sun Meiqi, et al. Photoinduced dynamically tunable terahertz metamaterial absorber[J].Journal of Southeast University(English Edition), 2024, 40(2):148-154.DOI:10.3969/j.issn.1003-7985.2024.02.005.

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