COMPARATIVE STUDY OF NANO-ROD AND NANO-SPHERE BASED LOCALIZED SURFACE PLASMON RESONANCE REFRACTIVE INDEX BIOSENSORS

Localized Surface Plasmon Resonance (LSPR) waves generated by the interaction of light with noble metal nanoparticles has been of great interest in recent years due to the high sensitivity of the extinction spectra of these nanoparticles to the medium\u27s surrounding refractive index up to the atomic level. In this article, we simulate the extinction spectra of noble metal sphere and rod nanoparticles in order to study the effect of the geometrical shape and size of the nanoparticle on the sensitivity and detection accuracy performance parameters of the extinction spectra. We also simulated the response of the sphere and rod nanoparticle\u27s extinction spectra to variation in the refractive index of the surrounding medium quantifying this response into performance parameter measurements. For the same medium refractive index, our findings suggest that the range of operation of the nanoparticle differs due to a change in its size and shape. Our findings also suggest that nano-rod based sensors offer substantially higher performance parameters compared to nano-sphere based sensors estimated by a 237.035% increase of sensitivity and 5.307% increase of detection accuracy when the medium refractive index increases by 80% from the reference value