Transverse magneto-optical Kerr effect enhanced at the bound states in continuum

TL;DR

This paper theoretically demonstrates that the transverse magneto-optical Kerr effect (TMOKE) can be resonantly enhanced in a patterned waveguide made from a diluted magnetic semiconductor when in resonance with a bound state in continuum, highlighting potential for resonant magneto-optics.

Contribution

It introduces a theoretical analysis showing TMOKE enhancement at bound states in continuum in dielectric nanostructures, which was not previously explored.

Findings

TMOKE is resonantly enhanced at bound states in continuum.

Enhancement is due to increased quality factor from far-field interference.

Potential applications in resonant magneto-optical devices.

Abstract

We calculate theoretically the transverse magneto-optical Kerr effect (TMOKE) in the periodically patterned waveguide made from a diluted magnetic semiconductor. It is demonstrated that the TMOKE is resonantly enhanced when the incident wave is in resonance with the bound state in continuum, arising when the quality factor of the waveguide mode increases due to the far-field interference. Our results uncover the potential of all-dielectric and semiconductor nanostructures for resonant magneto-optics.