Goos–Hänchen Shift Spatially Resolves Magneto-Optical Kerr Effect Enhancement in Magnetoplasmonic Crystals
Anastasia V. Makarova, Anastasia A. Nerovnaya, Dmitry N. Gulkin, В. В. Попов, М. А. Фролов, Andrey A. Fedyanin
Abstract
We report on how observation of the Goos–Hänchen (GH) shift can be used to spatially resolve the transverse magneto-optical Kerr effect (TMOKE) enhancement in all-nickel magnetoplasmonic crystals (MPCs). First, the excitation of surface plasmons in the MPCs leads to a 15.3 μm (18λ) GH shift. Then, in the presence of a transverse magnetic field, the modulation of the lateral spatial intensity distribution of the reflected light [TMOKE( x )], caused by the GH shift, reaches 4.7% in the experiment. The spatially resolved TMOKE( x ) values are several times higher compared to those from conventional TMOKE measurements in the MPCs. The concept of the spatially resolved magneto-optical effects under GH shift can be further extended to other magnetophotonic nanodevices for additional enhancing magneto-optical effects, sensing, and light modulation applications.