Angle Dependence of Photonic Enhancement of Magneto-Optical Kerr Effect in DMS Layers

TL;DR

This paper theoretically explores how the magneto-optical Kerr effect in DMS layers can be significantly enhanced by photonic crystal structures, with the enhancement depending on the angle and polarization of incident light.

Contribution

It introduces a design that leverages photonic crystals to tune and maximize the MOKE enhancement in DMS layers based on incident angle and polarization.

Findings

Up to tenfold MOKE enhancement predicted.

Maximum enhancement occurs at normal incidence for TE polarization.

Maximum enhancement occurs at Brewster angle for TM polarization.

Abstract

We investigate theoretically an angle dependence of enhancement of polar magneto-optical Kerr effect (MOKE) obtained thanks to a deposition of a paramagnetic Diluted Magnetic Semiconductor (DMS) layer on one-dimensional photonic crystal layer. Our transfer matrix method based calculations conducted for TE and TM polarizations of the incident light predict up to an order of magnitude stronger MOKE for a (Ga,Fe)N DMS layer when implementing the proposed design. The maximum enhancement for TE and TM polarization occurs for the light incidence at the normal and at the Brewster angle, respectively. This indicates a possibility of tuning of the MOKE enhancement by adjustment of the polarization and the incidence angle of the light.