Magneto-optics of the 2D iron-garnet nanocylinder array with localized and lattice modes

TL;DR

This study demonstrates that two-dimensional arrays of bismuth-substituted iron-garnet nanocylinders significantly enhance magneto-optical effects like Faraday rotation and TMOKE by exciting localized and lattice modes, promising for advanced optical applications.

Contribution

It introduces a nanocylinder array structure that simultaneously excites localized and lattice modes to boost magneto-optical effects beyond smooth films.

Findings

Faraday rotation increased 3 times

TMOKE enhanced by an order of magnitude

Wide spectral and angular range enhancement

Abstract

We experimentally show the enhancement of the Faraday and transverse magneto-optical Kerr effects in the two-dimensional arrays of nanocylinders made of bismuth-substituted iron-garnet and supporting both localized and lattice modes. Simultaneous excitation of these modes makes it possible to increase the Faraday rotation by 3 times and TMOKE by an order of magnitude compared to the smooth magnetic film of the equal effective thickness. Both magneto-optical effects are enhanced in wide spectral and angular ranges making the nanocylinder array magnetic dielectric structures promising for applications with short and tightly-focused laser pulses.