Double Symmetry-Protected Bound States in the Continuum in an All-Dielectric Metasurface for Refractive Index Sensing

Sun, Guanghou; Chao, Xingbing; Liu, Jianqiang; Wang, Qingkai; Chang, Zhangyong; Wei, Jianning

doi:10.1007/s11468-022-01741-5

Cited by 6 publications

(2 citation statements)

References 35 publications

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“…The high Q factor, low loss, and stability of the resonance peaks are important for evaluating the performance of the metasurface. The rectangular slot-based silicon nanodisc [32] excites quasi-BICs by means of structure breaking, with a large degree of shift of the resonance peaks and a high Q factor of only 10 3 orders of magnitude compared to the present structure. The metallic double ellipsoid structure [33] excites the quasi-BIC by changing the rotation angle of the structure, which greatly ensures the stability of the resonance peaks yet the high Q factor remains on the order of 10 3 due to ohmic losses.…”

Section: Q Mmentioning

confidence: 74%

Mechanism of formation and evolution of bound states in the continuum of split-hole all-dielectric metasurface under asymmetric displacement perturbation

Chen,

Zhao,

et al. 2024

Phys. Scr.

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Bound states in the continuum (BICs) with ultra-high Q properties have attracted much attention for their perfect localization in the continuous spectral range coexisting with extended waves. In this study, breaking the traditional excitation form of structure breakage or excitation field asymmetry, a monomeric silicon nanodisk array with relative displacement generated by the complete splitting of square nanopores is proposed based on the unique electromagnetic properties of all-dielectric metamaterials. During the introduction of perturbations by asymmetric displacements of splitting holes, it is shown by numerical simulations that two BICs at different wavelengths can be realized. Combined with eigenmodes of group theory, the symmetric matching relationship between the symmetry-protected BICs and the free-space radiation during the evolution process is analytically demonstrated, and the formation mechanism and the evolution law of the BICs excited by this metasurface are deeply investigated. meanwhile, it also provides a theoretical basis for the polarization dependence of quasi-BICs excitation and the ultra-high Q factor expression of BICs. Furthermore, near-field distribution and multipole decomposition show that the field distribution and surface currents support the excitation of BIC-driven toroidal dipole and magnetic quadrupole dual modes. This study not only provides an effective reference for the stability of high-Q resonance wavelengths, but also solves the problem of the lack of universality in analyzing the resonance mechanism based on resonance phenomena, and provides solid theoretical support for the study of displacement-mediated BICs resonance excitation and evolution.

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Section: Q Mmentioning

confidence: 74%

Mechanism of formation and evolution of bound states in the continuum of split-hole all-dielectric metasurface under asymmetric displacement perturbation

Chen,

Zhao,

et al. 2024

Phys. Scr.

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“…When the surrounding RI changes from 1.32 to 1.36, compared to the sensitivity of resonance D 2 , a higher sensitivity of resonance D 1 with a sensitivity of 160 nm RIU −1 is obtained, while for resonance of D 2 , a higher FOM of 575 RIU −1 is obtained. Subsequently, Sun et al propose an analogous metasurface composed of a periodically arranged silicon disk etched with a rectangular slot (figure 13(e)) [112]. Multi-resonant wavelengths have been achieved for RI sensing (figure 13 Cai et al present a polarization-insensitive silicon tetramer metasurface on a SiF 2 substrate [114].…”

Section: All-dielectric Infrared and Visible Metasurfacesmentioning

confidence: 99%

Emerging metasurfaces for refractometric sensing: fundamental and applications

Zhang,

Tu,

et al. 2024

J. Phys. D: Appl. Phys.

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Metasurfaces are designed to introduce strong light matter interactions by anomalously manipulating the properties of light at subwavelength scale, which have been employed to enhance performances in various sensing techniques, such as chiral sensing, surface-enhanced spectroscopy, and infrared absorption, among others. In recent decades, the label-free metasurface based refractometric sensor has been an active research field for biosensing, chemical sensing and gas sensing, owing to its non-invasive nature, real-time characterization and convenient operation principle, which significantly suppress the potential contamination to target species compared to other sensing methods (e.g., fluorescence sensing). In this review, we briefly discuss the recent advances on metasurface refractometric sensors, including their physical principles, device structures and characterizations, and focus on their associated applications in biochemical and gas sensing.

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Multiwavelength Gas Sensing with Quasi-Bound States in the Continuum in an All-Dielectric Metamaterial of Permittivity-Asymmetric Nanoring Dimer

et al. 2023

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Double Symmetry-Protected Bound States in the Continuum in an All-Dielectric Metasurface for Refractive Index Sensing

Cited by 6 publications

References 35 publications

Mechanism of formation and evolution of bound states in the continuum of split-hole all-dielectric metasurface under asymmetric displacement perturbation

Mechanism of formation and evolution of bound states in the continuum of split-hole all-dielectric metasurface under asymmetric displacement perturbation

Emerging metasurfaces for refractometric sensing: fundamental and applications

Multiwavelength Gas Sensing with Quasi-Bound States in the Continuum in an All-Dielectric Metamaterial of Permittivity-Asymmetric Nanoring Dimer

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