Optical Kerr nonlinearity of dielectric nanohole array metasurface in proximity to anapole state

TL;DR

This paper demonstrates that dielectric nanohole array metasurfaces near an anapole state exhibit significantly enhanced optical Kerr nonlinearity while maintaining high transmission, promising for nonlinear optical applications.

Contribution

It reveals the potential of anapole resonances in dielectric metasurfaces to greatly amplify Kerr nonlinearity without sacrificing transmission efficiency.

Findings

Kerr nonlinearity increases by orders of magnitude near anapole state

Optical transmission can reach up to unity

Enhanced nonlinear response in high-index dielectric metasurfaces

Abstract

Metasurfaces have attracted a great deal of attention from researchers due to their prominent optical properties. In particular, metasurfaces may consist of structures possessing optical anapole resonances with strong field confinement and substantially suppressed scattering. As a result, such nanostructures display enhanced nonlinear optical properties. In this paper by means of three-dimensional finite-difference time-domain simulations, the ability of anapole modes in high-index dielectric metasurfaces with circular nanopores is shown. In the vicinity of the anapole state, the effective optical Kerr nonlinearity increases by orders of magnitude. Simultaneously, the optical transmission of the metasurface can reach high values up to unity.