Resonant lattice Kerker effect in metasurfaces with electric and magnetic optical responses

TL;DR

This paper demonstrates how to achieve the resonant lattice Kerker effect in metasurfaces by tuning lattice periods to overlap electric and magnetic dipole resonances, leading to suppressed light reflection.

Contribution

It introduces a method to independently tune lattice periods in orthogonal directions to realize the resonant lattice Kerker effect in nanoparticle arrays.

Findings

Full overlap of ED and MD lattice resonances is achievable.

Strong suppression of light reflectance occurs at resonance conditions.

Array size influences reflectance and transmittance behavior.

Abstract

To achieve efficient light control at subwavelength dimensions, plasmonic and all-dielectric nanoparticles have been utilized both as a single element as well as in the arrays. Here we study 2D periodic nanoparticle arrays (metasurfaces) that support lattice resonances near the Rayleigh anomaly due to the electric dipole (ED) and magnetic dipole (MD) resonant coupling between the nanoparticles. Silicon and core-shell particles are considered. We demonstrate for the first time that, choosing of lattice periods independently in each mutual-perpendicular direction, it is possible to achieve a full overlap between the ED-lattice resonance and MD resonances of nanoparticles in certain spectral range and to realize the resonant lattice Kerker effect (resonant suppression of the scattering or reflection). At the effect conditions, the strong suppression of light reflectance in the structure is appeared due to destructive interference between electromagnetic waves scattered by ED and MD moments of every nanoparticle in the backward direction with respect to the incident light wave. Influence of the array size on the revealed reflectance and transmittance behavior is discussed. The resonant lattice Kerker effect based on the overlap of both ED and MD lattice resonances is also demonstrated.