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Delocalized electric field enhancement through near-infrared quasi-BIC modes in a hollow cuboid metasurface

Abstract: The two main problems of dielectric metasurfaces for sensing and spectroscopy based on electromagnetic field enhancement are that resonances are mainly localized inside the resonator volume and that experimental Q-factors are very limited. To address these issues, a novel dielectric metasurface supporting delocalized modes based on quasi-bound states in the continuum (quasi-BICs) is proposed and theoretically demonstrated. The metasurface comprises a periodic array of silicon hollow nanocuboids patterned on a glass substrate. The resonances stem from the excitation of symmetry-protected quasi-BIC modes, which are accessed by perturbing the arrangement of the nanocuboid holes. Thanks to the variation of the unit cell with a cluster of four hollow nanocuboids, polarization-insensitive, delocalized modes with ultra-high Q-factor are produced. In addition, the demonstrated electric field enhancements are very high (103-104). This work opens new research avenues in optical sensing and advanced spectroscopy, e.g., surface-enhanced Raman spectroscopy.

 Autoría: Algorri J.F., Dmitriev V., López-Higuera J.M., Zografopoulos D.C.,

 Fuente: Nanomaterials, 2023, 13(20), 2771

 Editorial: MDPI

 Fecha de publicación: 16/10/2023

 Nº de páginas: 10

 Tipo de publicación: Artículo de Revista

 DOI: 10.3390/nano13202771

 ISSN: 2079-4991

 Proyecto español: PID2019-107270RB-C21