Design of MO-SPR sensor element with photonic crystal

Abstract

Magneto-plasmonic response in planar multilayer with prism coupling composed from Fe/Au bi-layer supplied by photonic crystal (Ta2O5/SiO2 bi-layers) is studied. Modeled structure is intended as a sensor unit combining magneto-optical (MO) and surface-plasmon-resonance (SPR) effects. The sensitivity of MO-SPR system by small variations of analyte refractive index is tested to obtain optimal resolution ability. The non-reciprocal MO-SPR response is studied by means of the function p(phi) = (R-p((+))- R-p((-)))/(R-p((+)) + R-p((-))), where the reflectance Rp depends on the incidence angle phi and external magnetic field orientation by a fixed wavelength. The detection ability is characterized by the angular shift Delta phi(o) between the null-points of the function p that corresponds to the change Delta n(a) of analyte refractive index. Besides the key role of metallic layers thicknesses the number and size of Ta2O5/SiO2 bi-layers of photonic crystal are discussed. The magneto-plasmonic response in planar multilayer with prism coupling composed from Fe and Au bilayer supplied by photonic crystal (Ta2O5/SiO2) is studied. Modeled structure is intended as a sensor unit combining MO and SPR effects.