Abstract
. Surface Plasmon Resonance (SPR) technology has been adapted to produce a sensitive optical sensor and Biosensor applications. Simulation analysis ( in Matlab) has been made for SPR for gold (Au) layer with thickness (40 nm) and Polyvinyl Alcohol (PVA) polymer with various thickness (10, 20, 30, 40, 50, 60, 70 and 80 nm) deposited on glass prism type D-ZLAF50_Dense lanthanum flint. The sensitive layer was air (n=1). The analysis was taken for different wavelengths from Ultra-Violet wavelength 100 nm to Near Infra- Red wavelength 1000 nm. The properties of θSPR have been calculated from plotted reflectance against incident angle θincid.. The SPR sensitivity (S) was calculated. The results give efficient detection in change of sensitive layer refractive index (0, 0.04, 0.08 and 0.12), and obtained the maximum sensitivity 207.5 for thickness of PVA 40 nm and 50 nm, ∆n= 0.08 at wavelength 800nm and 1000nm, respectively. The best sensitivity in visible region (700 nm) is 158.33 for thickness 20nm, ∆n= 0.12.
Highlights
Surface plasmon is characterized as oscillations of free electrons in metal that, when excited by optical radiation, cause electromagnetic waves at the metal-dielectric interface, known as surface plasmon waves [1]
The sensing operation of a Surface Plasmon Resonance (SPR) detector depends on the plasmonic material working in this design
SPR peak does not appear at wavelengths below 600nm for all thickness of Polyvinyl Alcohol (PVA) layer
Summary
Surface plasmon is characterized as oscillations of free electrons in metal that, when excited by optical radiation, cause electromagnetic waves at the metal-dielectric interface, known as surface plasmon waves [1]. SPR is a sensitive technique for observing changes in optical properties in the speedy vicinity of a sensor surface.It is very suitable in bio sensing and surface science research [3], because of its great sensitive behavior, and capability for label-free sensing. This phenomenon has been emphasized as a controlling optical detection technique [4,5,6]. It has greater optical damping and broader resonance wavelength peak leading to false positive analytic detections [8]
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