All-optical Hall effect by the dynamic toroidal moment in a cavity-based metamaterial

TL;DR

This paper demonstrates an all-optical Hall effect driven by a dynamic toroidal moment in a plasmonic metamaterial, revealing new possibilities for optical phenomena and applications in nanophotonics.

Contribution

It introduces a novel optical plasmonic metamaterial that exhibits a dynamic toroidal response and demonstrates an all-optical Hall effect, mimicking magnetoelectric effects.

Findings

Demonstration of a dynamic dipolar toroidal response in a plasmonic metamaterial.

Observation of a large Purcell factor due to deep-subwavelength mode volume.

Numerical evidence of an all-optical Hall effect induced by the optical toroidal moment.

Abstract

Dynamic dipolar toroidal response is demonstrated by an optical plasmonic metamaterial composed of double disks. This response with a hotspot of localized E-field concentration is a well-behaved toroidal cavity mode that exhibits a large Purcell factor due to its deep-subwavelength mode volume. All-optical Hall effect (photovoltaic) due to this optical toroidal moment is demonstrated numerically, in mimicking the magnetoelectric effect in multiferroic systems. The result shows a promising avenue to explore various optical phenomena associated with this intriguing dynamic toroidal moment.