Resonant Magnetooptical Effects in Encapsulated 1D Plasmonic Crystals

• Published in: Advanced photonics research Vol. 3; no. 5
• Main Authors: Pomozov, Alexander R., Maydykovskiy, Anton I., Ketsko, Valerii A., Stognij, Alexander I., Murzina, Tatiana V.
• Format: Journal Article
• Language: English
• Published: Hoboken John Wiley & Sons, Inc 01-05-2022; Wiley-VCH
• Subjects: Design; Dielectric properties; Electrons; Geometry; Gold; iron garnet; Light; Localization; Magnetic fields; magnetooptics; plasmonic waveguides; Spectrum analysis; surface plasmon polaritons
• ISSN: 2699-9293; 2699-9293
• DOI: 10.1002/adpr.202100329

New approaches for the composition of efficient robust plasmonic crystals are very desired for practical applications as well as for the observation of new exciting effects at the nanoscale. Herein, both experimentally and theoretically resonant optical effects in encapsulated magnetoplasmonic crystals composed of a 1D gold grating sandwiched between two layers of iron garnet with slightly different dielectric properties are studied. It is demonstrated that depending on the geometry of the magnetic field application, various mechanisms provide resonant enhancement of the magnetooptical (MO) response of the structure; the strongest MO effect is attained for the case of waveguide modes propagating in iron garnet dielectric layer along the longitudinal magnetic field, when the magnetization‐induced rotation of the polarization plane up to a few degrees is observed. The obtained results demonstrate high potential of magnetoplasmonic waveguides as stable and efficient plasmonic devices.
Encapsulated magnetoplasmonic crystals (MPC) composed of a 1D gold grating sandwiched between two iron garnet layers are fabricated using a combined ion beam method and pulsed thermal annealing of the upper polycrystalline bismuth‐substituted garnet nanofilm. Excitation of plasmonic and waveguide modes provides resonant enhancement of the MPC magnetooptical response due to local field effects at magnetic interfaces.