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Experimental demonstration of a silicon-slot quasi-bound state in the continuum in near-infrared all-dielectric metasurfaces

Abstract: We theoretically and experimentally investigate a metasurface supporting a silicon-slot quasi-bound state in the continuum (qBIC) mode resonating in the near-infrared spectrum. The metasurface is composed of circular slots etched in a silicon layer on a sapphire substrate. The symmetry of the metasurface unit cell is reduced in order to provide access to the symmetry-protected mode, whose properties are investigated by finite-element full-wave and eigenfrequency analysis. The measured transmittance spectra verify the excitation of the investigated qBIC mode with experimental quality factors exceeding 700. The near-field distribution of the resonant qBIC mode shows strong field confinement in the slots, leading to high sensitivity values for refractometry.

 Autoría: Algorri J.F., Dell'Olio F., Ding Y., Labbé F., Dmitriev V., López-Higuera J.M., Sánchez-Pena J.M., Andreani L.C., Galli M., Zografopoulos D.C.,

 Fuente: Optics and Laser Technology, 2023, 161, 109199

Editorial: Elsevier

 Fecha de publicación: 01/06/2023

Nº de páginas: 7

Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.optlastec.2023.109199

ISSN: 0030-3992

 Proyecto español: TEC2016-77242-C3-1-R

Url de la publicación: https://doi.org/10.1016/j.optlastec.2023.109199

Autoría

FRANCESCO DELL´OLIO

DING, YUNHONG

LABBÉ, FABIEN

DMITRIEV, VICTOR ALEXANDROVIC

JOSE MANUEL SANCHEZ PENA

ANDREANI, LUCIO CLAUDIO

GALLI, MATTEO

ZOGRAFOPOULOS, DIMITRIOS C.