@article{10902/30602,
year = {2023},
month = {10},
url = {https://hdl.handle.net/10902/30602},
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.},
organization = {This work is part of the PID2019-107270RB-C21, PDC2021-121172-C21m and TED2021-130378B-C21 project funded by MCIN/AEI/10.13039/501100011033, FEDER, and EU NextGenerationEU/PRT. J.F.A. received funding from Ministerio de Ciencia, Innovación y Universidades of Spain under Juan de la Cierva-Incorporación grant. D.C.Z and V.D. acknowledge the support of the CNR-FAPESP biennial (2022–2023) bilateral project StReAM “Strongly Resonant All-dielectric Metasurfaces based on quasi-dark and toroidal modes”. V.D. thanks the Brazilian Agency National Council of Technological and Scientific Development (CNPq) for financial support.},
publisher = {MDPI},
publisher = {Nanomaterials, 2023, 13(20), 2771},
title = {Delocalized electric field enhancement through near-infrared quasi-BIC modes in a hollow cuboid metasurface},
author = {Algorri Genaro, José Francisco and Dmtriev, Victor and López Higuera, José Miguel and Zografopoulos, Dimitrios C.},
}