Abstract
The resonant excitation of the surface plasmon–polariton waves by the prism structure, where a thin silver film was coated on the prism, was studied. New analytical relations between the angular and spectral sensitivities on the change of the medium refractive index, adjacent to the metal film, were obtained. In addition, the analytical relation between the full width at the half maximum of the spectral and angular resonance dependencies were found.
Highlights
Biochemical reactions occurring in liquid solutions affect the refractive index of the solution itself
Numerical calculations have shown that the resonant excitation of the surface plasmon–polariton wave occurs in the prism-based structure at carefully selected parameters, namely the refractive index of the prism material, the angle of the beam incidence, wavelength, thickness of the metal film and the refractive index of the researched medium
It is shown that the full width at the half maximum of the spectral and angular resonance dependencies are related by Equation (11)
Summary
Biochemical reactions occurring in liquid solutions affect the refractive index of the solution itself. Numerical calculations have shown that the resonant excitation of the surface plasmon–polariton wave occurs in the prism-based structure at carefully selected parameters, namely the refractive index of the prism material, the angle of the beam incidence, wavelength, thickness of the metal film and the refractive index of the researched medium. Theoretical studies and numerical analysis make it possible to understand the physical processes of plasmon–polariton resonance in the prism structure It allows to relate the properties of the dielectric–metal film–dielectric waveguide with the sensitivity (spectral and angular) of the prism structure on the change in the researched medium refractive index. The analytical Equations relating the sensor sensitivity with the waveguide properties of the dielectric–thin metal film–dielectric waveguide were founded This made it possible to determine the reflection coefficient from the metal film depending on the wavelength, angle of incidence on the metal film, its thickness, and other parameters of the prism structure. Knowing the propagation constant β, one can determine the resonant incidence angle θ of the plane wave
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