Anisotropic propagation of Surface Plasmon Polaritons: study and exploitations

作者: Enrico Gazzola

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摘要: Sinusoidally patterned metallic surfaces, known as plasmonic gratings, constitute one of the principal structures which allow to achieve coupling between an incident light beam and a Surface Plasmon Polariton mode. A variety phenomena are available when grating is rotated azimuthal angle with respect incidence plane. Aim this work comprehensive investigation propagation properties surface mode under configuration, correlating role anisotropy introduced by position shape resonance dip in reflectance spectra. Analytical models physical interpretations provided; both experimental computational means exploited order validate models, including observation innovative effects. Thin-film coupled modes, Long Range Short Polaritons, studied experimentally observed azimuthally configuration. Special attention paid plasmon radiative losses, due scattering grating. Their dependence on amplitude direction unraveled, correlated width resonances. The outcomes these analyses lead evaluation sensitivity Figure Merit achievable considered configurations framework Resonance sensing. The developed concepts methods proved be valuable tools predict understand response actual applied sensing devices against gaseous analytes. Experimental tests platforms TNT, hydrogen aromatic compounds sensors reported, giving promising results. particularly remarkable experiment combined exploitation modes configuration sensibly enhance performance xylene sensor