• Journal of Terahertz Science and Electronic Information Technology
  • Vol. 22, Issue 7, 689 (2024)
ZHAO Zhengtao1, ZHANG Yaqian2, XIAO Zhongyin1,*, and LIU Dejun2
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
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    DOI: 10.11805/tkyda2024096 Cite this Article
    ZHAO Zhengtao, ZHANG Yaqian, XIAO Zhongyin, LIU Dejun. Polarization-independent quasi-Bound states In the Continuum based on terahertz all metal metasurfaces[J]. Journal of Terahertz Science and Electronic Information Technology , 2024, 22(7): 689 Copy Citation Text show less

    Abstract

    A terahertz(THz) all-metal metasurface with a high Q-factor has been proposed,consisting of four diamond-shaped holes. By altering the size of adjacent diamond-shaped holes, the symmetry of the structure can be broken, resulting in quasi-Bound states In the Continuum(BICs). By changing the polarization angle of the incident wave, the frequency of the excited quasi-BICs remains unchanged, exhibiting polarization-independent characteristics. Simulation results show that, by optimizing structural parameters, when the size deviation is 3 μm, the quasi-BICs achieved an ultranarrow bandwidth of less than 1 GHz, corresponding to a Q-factor greater than 1 300. Experimental test results show that the fabricated sample(with a deviation of 30 μm) had a measured Q-factor of 40.Compared to circular hole structures, the diamond-shaped hole structure can achieve stronger bound fields due to its sharp corners. The proposed metasurface with polarization-independent quasi-BICs has enormous practical application potential in real-time chemical and biomolecular sensing.
    ZHAO Zhengtao, ZHANG Yaqian, XIAO Zhongyin, LIU Dejun. Polarization-independent quasi-Bound states In the Continuum based on terahertz all metal metasurfaces[J]. Journal of Terahertz Science and Electronic Information Technology , 2024, 22(7): 689
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