@article{10902/32790,
year = {2021},
month = {1},
url = {https://hdl.handle.net/10902/32790},
abstract = {Bound states in the continuum (BICs) emerge throughout physics as leaky/resonant modes that remain, however, highly localized. They have attracted much attention in optics and photonics, and especially in metasurfaces, that is, planar arrays of sub-wavelength meta-atoms. One of their most outstanding features is the arbitrarily large Q-factors they induce upon approaching the BIC condition, which is exploited here to achieve a narrow transparency band. It is first shown how to shift a canonical BIC in an all-dielectric metasurface, consisting of high-refractive disks exhibiting in- and out-of-plane magnetic dipole (MD) resonances, by tuning the periodicity of the array. By means of the coupled electric/magnetic dipole formulation, it is shown analytically that when the quasi-BIC overlaps with the broad (in-plane MD) resonance, a full transparency band emerges with diverging Q-factor upon approaching the BIC condition in parameter space. Finally, the experimental measurements in the microwave regime with a large array of high-refractive-index disks confirm the theoretical predictions. The results reveal a simple mechanism to engineer an ultra-narrow BIC-induced transparency band that can be exploited throughout the electromagnetic spectrum with obvious applications in filtering and sensing.},
organization = {J.A.S.-G. and D.R.A. acknowledge partial financial support from the Spanish Ministerio de Ciencia e Innovación (MICIU/AEI/FEDER, UE) through the grants MELODIA (PGC2018-095777-B-C21) and NANOTOPO (FIS2017-91413-EXP), and from the Ministerio de Educación, Cultura y Deporte through a Ph.D. Fellowship (FPU15/03566). A.B. acknowledges the funding support from the Humboldt Research Fellowship from the Alesander von Humboldt Foundation.},
publisher = {Wiley-VCH GmbH},
publisher = {Laser and Photonics Reviews, 2021, 15(1), 2000263},
title = {High-Q transparency band in all-dielectric metasurfaces induced by a quasi bound state in the continuum},
author = {Abujetas, Diego R. and Barreda, Ángela and Moreno Gracia, Fernando and Litman, Amelie and Geffrin, Jean-Michel and Sánchez-Gil, José A.},
}