Magnetic hot-spots generation at optical frequencies in all-dielectric mesoscale Janus particles

TL;DR

This paper demonstrates the creation of intense magnetic hot spots at optical frequencies using all-dielectric Janus mesoscale particles, overcoming natural material limitations for magnetic effects in optics.

Contribution

It introduces a novel method to induce strong magnetic hot spots in dielectric Janus particles through combined photonic effects, enabling magnetic applications at optical frequencies.

Findings

Magnetic hot spots with H^2/E^2 contrast over 10

Magnetic field intensity enhancement exceeds 1000

Potential for practical magnetic optical applications

Abstract

At optical frequencies due to the small value of the magnetic permeability of natural materials, the magnetic effects are week. To this end, the natural dielectric materials are unemployable for practical magnetic applications in optics. We have shown that it is possible to induce the intense magnetic hot spots in a Janus dielectric mesoscale particle. The basic idea of the Janus particle based on a combination of the effects of a photonic jet, whispering gallery waves and the concept of solid immersion. Simulations show that H^2/E^2 contrast maybe more 10 and maximal magnetic field intensity enhancement is more than 1000 for a wavelength-scaled particle with refractive index less than 2.