Magneto-optics of subwavelength all-dielectric gratings


1- Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, 1-2, Moscow 119991, Russia
2 – Russian Quantum Center, Bolshoy Boulevard 30, bld. 1, Moscow 121205, Russia
3 – Physics Department, Michigan Technological University, Houghton, MI 49931, USA
4 – Prokhorov General Physics Institute of the Russian Academy of Science, 38 Vavilov Street, Moscow 119991, Russia 

We provide the experimental research on a novel type of all-dielectric magnetic structure designed to achieve an enhanced magneto-optical response. 1D grating fabricated via etching of bismuth substituted iron garnet film supports the excitation of optical guided modes, which are highly sensitive to the external magnetic field. A unique feature of proposed structure is the synergetic combination of high transparency, tunability, high Q-factor of the resonances and superior magneto-optical response that is two orders higher in magnitude than in the non-structured smooth iron-garnet film. The considered all-dielectric magnetic garnet structures have great potential in various fields including the magneto-optical modulation of light, biosensing and magnetometry.

Voronov, A.A., Karki, D., Ignatyeva, D.O., Kozhaev, M.A., Levy, M. and Belotelov, V.I., 2020. Magneto-optics of subwavelength all-dielectric gratings. Optics Express, 28(12), pp.17988-17996.