Superscattering of pseudospin-1 wave in photonic lattice

TL;DR

This paper reveals a superscattering phenomenon in pseudospin-1 waves within photonic lattices, showing unusually strong scattering from weak scatterers due to revival resonances, challenging traditional scattering theories.

Contribution

It introduces the concept of superscattering in pseudospin-1 waves and explains its physical origin, supported by analytical and numerical evidence.

Findings

Superscattering occurs even with weak scatterers in subwavelength regimes.

Revival resonances are identified as the physical mechanism.

The phenomenon can be experimentally observed in synthetic photonic systems.

Abstract

We uncover a superscattering behavior of pseudospin-1 wave from weak scatterers in the subwavelength regime where the scatterer size is much smaller than wavelength. The phenomenon manifests itself as unusually strong scattering characterized by extraordinarily large values of the cross section even for arbitrarily weak scatterer strength. We establish analytically and numerically that the physical origin of superscattering is revival resonances, for which the conventional Born theory breaks down. The phenomenon can be experimentally tested using synthetic photonic systems.