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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.
Fuente: Sci Rep 9, 16048 (2019)
Publisher: Nature Publishing Group
Publication date: 01/11/2019
No. of pages: 11
Publication type: Article
DOI: 10.1038/s41598-019-52223-4
ISSN: 2045-2322
Publication Url: https://doi.org/10.1038/s41598-019-52223-4
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ABUJETAS, DIEGO R.
ÁNGELA INMACULADA BARREDA GÓMEZ
FERNANDO MORENO GRACIA
SÁENZ, JUAN J.
LITMAN, AMELIE
GEFFRIN, JEAN MICHEL
SÁNCHEZ GIL, JOSÉ A.
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