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Brewster quasi bound states in the continuum in all-dielectric metasurfaces from single magnetic-dipole resonance meta-atoms

Abstract: Bound states in the continuum (BICs) are ubiquitous in many areas of physics, attracting special interest for their ability to confine waves with infinite lifetimes. Metasurfaces provide a suitable platform to realize them in photonics; such BICs are remarkably robust, being however complex to tune in frequency-wavevector space. Here we propose a scheme to engineer BICs and quasi-BICs with single magnetic-dipole resonance meta-atoms. Upon changing the orientation of the magnetic-dipole resonances, we show that the resulting quasi-BICs, emerging from the symmetry-protected BIC at normal incidence, become transparent for plane-wave illumination exactly at the magnetic-dipole angle, due to a Brewster-like effect. While yielding infinite Q-factors at normal incidence (canonical BIC), these are termed Brewster quasi-BICs since a transmission channel is always allowed that slightly widens resonances at oblique incidences. This is demonstrated experimentally through reflectance measurements in the microwave regime with high-refractive-index mm-disk metasurfaces. Such Brewster-inspired configuration is a plausible scenario to achieve quasi-BICs throughout the electromagnetic spectrum inaccessible through plane-wave illumination at given angles, which could be extrapolated to other kind of waves.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Sci Rep 9, 16048 (2019)

Editorial: Nature Publishing Group

 Fecha de publicación: 01/11/2019

Nº de páginas: 11

Tipo de publicación: Artículo de Revista

DOI: 10.1038/s41598-019-52223-4

ISSN: 2045-2322

Url de la publicación: https://doi.org/10.1038/s41598-019-52223-4

Autores/as

ABUJETAS, DIEGO R.

ANGELA INMACULADA BARREDA GOMEZ

SÁENZ, JUAN J.

LITMAN, AMELIE

GEFFRIN, JEAN MICHEL

SÁNCHEZ GIL, JOSÉ A.