Silver Prism Interface Surface Plasmon Resonance (SPR) for Biosensor in UV-Visible Spectrum Region

Abstract

Surface plasmon resonance (SPR) sensors have been extensively employed in biological and chemical detection because they can carry out simple, direct, extremely sensitive, and in-the-moment detection. They can be used to create a simulation model for different silver (Ag) layer thicknesses ( ) deposited on a semicircular glass prism. The D-ZLAF50 uses water as the sensing medium and can be turned on by an evanescent generated by total internal reflection on the sensor surface in the Kretschmann setup. The SPR phenomenon cannot be noticed in the ultraviolet area using the simulation technique for the suggested sensor. However, it can be seen faintly in the visible region, starting at wavelengths of 600 and 700 nm. Also, the simulation results show that this sensor, demonstrating operational stability, can be used in the visible region of the spectrum at a wavelength of 600 nm. When an aqueous sensor is used to detect any changes in the refractive index by an amount ∆n ≥ 0.02, the sensitivity values ​​fall in the range of . The length of the SPR dip is close to  = 0.9, and FWHM values range between  when the thickness  varies from 10 to 80 nm.