Effect of Dielectric Constant on Metal-Dielectric Nanoshell for Sensing Application

In plasmonic nanoshell, material properties are used to functionalize them for optical biosensing applications. The applications use resonance light scattering properties, which shows a sizeable energy shift with change in the nanoshell parameters i.e. dielectric constants and thickness of the shell radius. In this work, we introduce an alternate explanation of this energy shift using linear circuit theory. The analogy of passive linear circuits elements of resonance is used to explain the shift in light scattering, crucial for biosensing applications. We also show the dependence of the values of individual components of the resonance circuit on sensitivity of optical detection. The derived model is simple and accurate, which helps in the improved understanding and applications of the tunable nanoshell based biosensors.