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17 August 2023 High sensitivity sensing by all-dielectric metasurface via dual bound states in the continuum
Qin-Ke Liu, Sha Chen, Zhendong Lu, Yaojie Zhou, Zhening Cao, Xiangyang Sun, Xin-Lin Wang
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Proceedings Volume 12757, 3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023); 127571J (2023) https://doi.org/10.1117/12.2690235
Event: 3rd International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2023), 2023, Kunming, China
Abstract
In recent years, bound states in the the continuum (BIC) on optical metasurfaces have received a lot of attention due to their unique properties. In this paper, an all-dielectric metasurface based on dual symmetry-protected BIC is proposed. By adjusting the in-plane symmetry of the structure by the size of the circular etch hole, dual quasi-BIC with high Qfactor can be generated, and the modes are analyzed by multipole expansion and near-field electromagnetic distribution. To further change the degree of asymmetry, dual quasi-BIC modes can be shifted and Q-factor adjusted. Finally, due to its potential for high sensitivity and flexible manipulation, this all-dielectric metasurface is well suited for Label free refractive index biosensing, enabling compact sensing devices for a wide range of applications.
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Qin-Ke Liu, Sha Chen, Zhendong Lu, Yaojie Zhou, Zhening Cao, Xiangyang Sun, and Xin-Lin Wang "High sensitivity sensing by all-dielectric metasurface via dual bound states in the continuum", Proc. SPIE 12757, 3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023), 127571J (17 August 2023); https://doi.org/10.1117/12.2690235
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KEYWORDS
Refractive index
Magnetism
Silicon
Electromagnetism
Near field
3D modeling
Biosensing
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