Surface Plasmon Resonance Enhanced the Transverse Magneto-optical Kerr Effect in One-dimensional Magnetoplasmonic Nanostructure

摘要

The properties of the optics and transverse magneto-optical Kerr effect (TMOKE) of one-dimensional magnetoplasmonic nanostructures are experimentally investigated. It shows that the resonant dips of the reflectance spectra and the enhancement of the TMOKE of the designed structures are attributed to the excitation and the coupling of the localized surface plasmon (LSP) and surface plasmon polariton (SPP) modes. Moreover, the insertion of the nonmagnetic dielectric SnO2 layer into the quadrilayer structure of Ag/Co/SnO2/Ag can not only pronouncedly enhance the TMOKE signals of the sample but also prompt their resonant positions to generate a blueshift. It has been demonstrated that the enhancement of the TMOKE signal and the blueshift of the resonant wavelength of the TMOKE stems from the coupling of SPP of the two different interfaces of the silver film.