Enhanced magneto-optical effects in hybrid Ni-Si metasurfaces

M G Barsukova,A A Fedyanin,A I Musorin,A S Shorokhov

doi:10.1063/1.5066307

Abstract

The multifold enhancement of the Faraday effect induced by magnetic dipole and Voigt effect amplification due to electric dipole Mie resonances of the magnetophotonic metasurface is demonstrated. The values of the magneto-optical responses up to 0.8° and 0.5% are experimentally observed for the metasurface with an ultrathin ferromagnetic layer. The results can be used for the development of novel active magnetophotonic metadevices.

Highlights

Localizing this surface wave near the magnetic dielectric can enhance the polarization magneto-optical effect.12 The modification of magneto-optical spectra was demonstrated in case the localized plasmons were hybridized with propagating surface plasmon waves
The phenomenon of MO effect enhancement is widely used for various applications in optical modulators,22 filters,23 isolators,24 sensors,25,26 and lasers
Another possible application is the magnetooptical data writing, where powerful femtosecond laser pulses can be used for magnetic order manipulating in gyrotropic materials

Summary

Introduction

Localizing this surface wave near the magnetic dielectric can enhance the polarization magneto-optical effect.12 The modification of magneto-optical spectra was demonstrated in case the localized plasmons were hybridized with propagating surface plasmon waves.13. Another mechanism to enhance MO is a slow light regime due to a multibeam interference in magnetophotonic crystals.14 These structures are advantageous as they are made of all-dielectric materials without metal inclusions and demonstrate a high value of Faraday rotation as well as transmittance.15,16 The intriguing results are observed in magnetophotonic crystals when the optical Tamm or Bloch surface states are excited.17–20 Recently, a novel method has been demonstrated to enhance the intensity magneto-optical effect.21 The excitation of magnetic dipole Mie resonance in far-standing silicon nanodisks covered with the thin nickel film leads to an increased magneto-optical response.

Results

Conclusion