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説明:

Metasurfaces composed of silicon-nanogap unit have a variety of optical resonances, including bound states in the continuum (BIC). We show comprehensive numerical results on metasurfaces of Si-nanogap units, analyze the optical resonances, and clarify optically prominent resonances as well as symmetry-forbidding resonances that are the BIC, based on the numerical analyses of optical spectra and resonant electromagnetic-field distributions. Introducing asymmetry in the unit cell, the BIC become optically allowed, being identified as magnetic dipole, electric quadrupole, and magnetic quadrupole resonances. Moreover, the optical resonances are examined in terms of refractive-index sensing performance. A pair of the resonances associated with electric-field localization at nanogap was found to be sensitive to the refractive index contacting with the metasurfaces. Consequently, the gap-mode resonances are shown to be suitable for a wide range of the refractive-index sensing over 1.0--2.0.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: all-dielectric metasurface, silicon nanogap, BIC, optical sensing, refractive index

刊行年月日: 2024-11-10

出版者: Multidisciplinary Digital Publishing Institute (MDPI)

掲載誌:

• Photonics (ISSN: 23046732) vol. 11 issue. 11 1053

研究助成金:

• 日本学術振興会 JP24K01389

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.3390/photonics11111053

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更新時刻: 2024-11-13 08:31:31 +0900

MDRでの公開時刻: 2024-11-13 08:31:31 +0900