Multipolar nonlinear nanophotonics

TL;DR

This paper reviews recent advances in multipolar nonlinear nanophotonics, focusing on how resonant nanostructures can be engineered for enhanced nonlinear effects and controlled light scattering at the nanoscale.

Contribution

It provides a comprehensive overview of the latest developments in multipolar analysis and design strategies for nonlinear nanophotonic devices across various nanostructure types.

Findings

Enhanced nonlinear effects through resonant nanostructures

Tailored far-field multipolar interference for directional scattering

Progress in hybrid and all-dielectric nanostructures

Abstract

Nonlinear nanophotonics is a rapidly developing field with many useful applications for a design of nonlinear nanoantennas, light sources, nanolasers, sensors, and ultrafast miniature metadevices. A tight confinement of the local electromagnetic fields in resonant photonic nanostructures can boost nonlinear optical effects, thus offering versatile opportunities for subwavelength control of light. To achieve the desired functionalities, it is essential to gain flexible control over the near- and far-field properties of nanostructures. Thus, both modal and multipolar analyses are widely exploited for engineering nonlinear scattering from resonant nanoscale elements, in particular for enhancing the near-field interaction, tailoring the far-field multipolar interference, and optimization of the radiation directionality. Here, we review the recent advances in this recently emerged research field ranging from metallic structures exhibiting localized plasmonic resonances to hybrid metal-dielectric and all-dielectric nanostructures driven by Mie-type multipolar resonances and optically-induced magnetic response.