Enhancement of magneto-optical effects by a single 1D all dielectric resonant grating

摘要

We demonstrate theoretically the enhancement of the four first-order magneto-optical effects using an all-dielectric 1D resonant grating. The modeled structure was designed for the Faraday effect at normal incidence at a wavelength of 1.55 mu m for which the calculated improvement is shown to be one hundred times the off-resonance values. At 1 degrees incidence, polar and longitudinal Kerr effects were also improved, showing polarization rotations up to 14 degrees. For the same incidence conditions, transverse magneto optical Kerr effect was also improved, leading to a reflectance difference of 12% for a reflectance intensity of 40%. These results are interesting for the development of magnetic-field sensors capable of detecting of several components of the field.