All-dielectric optical nanoantennas (Review)

TL;DR

This review discusses innovative all-dielectric nanoantennas, including highly efficient Yagi-Uda designs and superdirective silicon-based nanoantennas with magnetic resonances, analyzed through analytical, numerical, and experimental methods.

Contribution

It introduces a new class of highly efficient all-dielectric nanoantennas and the concept of superdirective nanoantennas based on silicon nanoparticles with magnetic responses.

Findings

Silicon nanoantennas exhibit strong magnetic resonances.

Superdirective nanoantennas enable nanoscale beam steering.

Analytical, numerical, and experimental studies validate designs.

Abstract

We propose a new type of highly efficient Yagi-Uda nanoantenna and introduced a novel concept of superdirective nanoantennas based on silicon nanoparticles. In addition to the electric response, this silicon nanoantennas exhibit very strong magnetic resonances at the nanoscale. Both types of nanoantennas are studied analytically, numerically and experimentally. For superdirective nanoantennas we also predict the effect of the beam steering at the nanoscale characterized by a subwavelength sensitivity of the beam radiation direction to the source position.