Authors: Razdolski, I; Armelles, G; Cebollada, A; Kirilyuk, A
Article.
Opt. Lett.. vol: 45. page: 0146-9592.
Date: AUG 1. 2020.
Doi: 10.1364/OL.395792.
Abstract:
Active modulation of nonlinear-optical response from metallic nanostructures can be realized with an external magnetic field. We report a resonant 20% magneto-refractive modulation in second-harmonic generation (SHG) from spintronic multilayer antennas in the midinfrared. We discuss mechanisms of this modulation and show that it cannot be explained by an unequal enhancement of the electromagnetic field. Instead, we propose a novel, to the best of our knowledge, contribution to the nonlinear susceptibility, which relies on the spin-dependent electron mean free path. In contrast to magneto-optics in ferromagnets, our approach allows simultaneous observation of the enhanced SHG and its large modulation. (C) 2020 Optical Society of America.
