Superscattering emerging from the physics of bound states in the continuum

Adrià Canós Valero (), Hadi K. Shamkhi, Anton S. Kupriianov, Thomas Weiss, Alexander A. Pavlov, Dmitrii Redka, Vjaceslavs Bobrovs, Yuri Kivshar () and Alexander S. Shalin ()
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Adrià Canós Valero: University of Graz, and NAWI Graz
Hadi K. Shamkhi: ITMO University
Anton S. Kupriianov: Jilin University
Thomas Weiss: University of Graz, and NAWI Graz
Alexander A. Pavlov: Institute of Nanotechnology of Microelectronics
Dmitrii Redka: Electrotechnical University LETI
Vjaceslavs Bobrovs: Riga Technical University, Institute of Telecommunications
Yuri Kivshar: Australian National University
Alexander S. Shalin: Moscow Institute of Physics and Technology

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract We study the Mie-like scattering from an open subwavelength resonator made of a high-index dielectric material, when its parameters are tuned to the regime of interfering resonances. We uncover a novel mechanism of superscattering, closely linked to strong coupling of the resonant modes and described by the physics of bound states in the continuum (BICs). We demonstrate that the enhanced scattering occurs due to constructive interference described by the Friedrich-Wintgen mechanism of interfering resonances, allowing to push the scattering cross section of a multipole resonance beyond the currently established limit. We develop a general non-Hermitian model to describe interfering resonances of the quasi-normal modes, and study subwavelength dielectric nonspherical resonators exhibiting avoided crossing resonances associated with quasi-BIC states. We confirm our theoretical findings by a scattering experiment conducted in the microwave frequency range. Our results reveal a new strategy to boost scattering from non-Hermitian systems, suggesting important implications for metadevices.

Date: 2023
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DOI: 10.1038/s41467-023-40382-y

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