Reaching the superscattering regime with BIC physics

Abstract

We uncover a novel mechanism of superscattering from subwavelength resonators linked to the physics of bound states in the continuum (BICs). Enhanced scattering occurs due to constructive interference within the Friedrich-Wintgen mechanism of interfering resonances. Through this process, the scattering cross section of a single resonance can exceed the currently established limit. We develop a general non-Hermitian model to describe interfering resonances of quasi-normal modes, and study subwavelength dielectric nonspherical resonators exhibiting avoided crossing resonances and quasi-BIC states. Our results reveal novel physics of non-Hermitian systems suggesting important applications for metadevices.

Exploring localized ENZ resonances and their role in superscattering, wideband invisibility, and tunable scattering

“…Next, the invisibility mechanisms based on plasmonic resonance 12 , single-mode interferences 13 , and specific interferences yielded by different modal/ resonant regimes 14 should be mentioned. Superscattering, a counterpart of the invisibility has been studied in various core-shell and multilayer structures [15][16][17][18][19][20][21][22][23][24][25][26][27] . It is often attributed to the effects exerted by (spoof) localized surface plasmon resonances (LSPRs) [28][29][30][31] .…”