Ms. Xiaoran Zhang Profile

Xiaoran Zhang

at Hebei Univ of Science and Technology

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Proceedings Article | 9 October 2021 Poster + Paper

Polarization-insensitive Fano resonance for highly-sensitive terahertz sensors

Ming Zhang, Qian Cheng, Xiaoran Zhang, Baozhu Wang, Najiao Zhang, Ze Ma, Cong Li

Proceedings Volume 11904, 119040V (2021) https://doi.org/10.1117/12.2597353

KEYWORDS: Terahertz radiation, Sensors, Refractive index, Polarization, Biosensing, Electromagnetism, Transmittance, Silicon, Resonance enhancement, Structural design

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The non-ionizing radiation and the high sensitivity to weak interactions of terahertz (THz) waves make THz technology a great applicability in the field of biosensing and medical detection. Besides, benefitted from the flexible capability of metasurface in manipulating the electromagnetic (EM) waves, the high-sensitivity THz sensors can be achieved to promote the development of THz sensing. However, the polarization dependence of hybrid-resonances-based metasurface and the single resonance cause the reduction in sensitivity, which is urgent to be settled. In this paper, we proposed a centrosymmetric metasurface to produce high-quality and polarization-insensitive resonance for improving the sensitivity of THz sensing. The designed metasurface is locally asymmetric, which can induce the high-quality Fano resonance. However, the entire structure is centrosymmetric and thus exhibits polarization-independent characterization. The designed metasurface possesses a polarization-independent resonance peak of transmittance spectrum in 0.1-2THz, which also shows high sensitivity related to ambient refractive index. The advantage of transmitted structure and polarizationindependent resonance can relief the difficulty of measurement. We believe these studies will promote the development of high-sensitivity THz biosensing.

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