All-Dielectric Optical Nanoantennas

TL;DR

This paper explores all-dielectric optical nanoantennas made of high-permittivity particles, highlighting their magnetic resonances and potential for more efficient, compact designs compared to plasmonic counterparts.

Contribution

It introduces a novel all-dielectric nanoantenna design leveraging magnetic resonances, improving efficiency and compactness over traditional plasmonic nanoantennas.

Findings

Dielectric nanoantennas exhibit strong magnetic resonances.

All-dielectric nanoantennas can outperform plasmonic ones in efficiency.

Potential for more compact optical antenna designs.

Abstract

We study in detail a novel type of optical nanoantennas made of high-permittivity low-loss dielectric particles. In addition to the electric resonances, the dielectric particles exhibit very strong magnetic resonances at the nanoscale, that can be employed in the Yagi-Uda geometry for creating highly efficient optical nanoantennas. By comparing plasmonic and dielectric nanoantennas, we demonstrate that all-dielectric nanoantennas may exhibit better radiation efficiency also allowing more compact design.