Surface Plasmon Resonance Biosensor in Healthcare Application Using Kretschsmann & Otto Configuration

Abstract

In this study, a planar D-shape optical fiber
sensor based on Surface Plasmon Resonance phenomenon using
two different excitation methods has been demonstrated. The
proposed bio-sensor uses Amplitude-Wavelength hybrid
detection technique to determine the change in urine refractive
index that depends on resonance parameters. The analysis
employs finite element method to investigate the optical
properties of the proposed sensor. From the results it can be
evident that Otto configuration offers greater amount of reflected
light intensity dip for a particular urine refractive index in
comparison with Kretschmann configuration. For an example,
for Otto configuration the dip of reflected light intensity
measured in terms of reflectance which attains a value 0.5 for ns
(urine refractive index) of 1.489 while Kretschmann
configuration provides a dip of 0.65 for the same value of ns.
Results also show that the sharpness of reflectance is
comparatively higher for the sensor using Otto configuration in
comparison with Kretschmann configuration in case of
wavelength interrogation. Thus, Otto configuration offers better
performance in comparison with Kretschmann configuration.