Design of MO-SPR sensor element with photonic crystal

• DOI: 10.1016/j.photonics.2018.06.007
• Publication Date: 2018-06-21T18:41:21Z
• Authors: P. Otipka; J. Vlček; M. Lesňák; J. Sobota
• Keywords: Prism

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 ρ(φ) = (Rp(+) − Rp(−))/(Rp(+) + Rp(−)), where the reflectance Rp depends on the incidence angle φ and external magnetic field orientation by a fixed wavelength. The detection ability is characterized by the angular shift Δφ0 between the null-points of the function ρ that corresponds to the change Δna 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.