The light passes through the prism at a fixed angle, then couple evanescently though dielectric medium and interact with the silver metal. Surface plasmons are excited at interface of metal and dielectric and decay exponentially along the distance from the interface. Part of the reflected light is absorbed due to coupling of incident light beam with SPPs. The dielectric medium is used to control the sensitivity of SPPs to our chance of demand.

Abstract

In this manuscript, Intensity interrogation of sensitivity of the surface plasmon polariton waves (SPPs) is coherently manipulated, at the interface of four-level dielectric medium and silver metal using prism geometry. Sensitivity of SPPs with respect to refractive index is written as dI/dnd$$ dI/d{n}_d $$. A useful control in sensitivity is reported with probe and control fields detuning, Rabi frequency and decay rate. Sensitivity is a function of probe field detuning and control field Rabi frequency. The maximum sensitivity is reported to 400 Wm−2/RIU$$ 400\;{\mathrm{Wm}}^{-2}/\mathrm{RIU} $$ with probe field detuning and control field Rabi frequency, while minimum sensitivity is investigated to 34 Wm−2/RIU$$ 34\;{\mathrm{Wm}}^{-2}/\mathrm{RIU} $$ with control field phase and control field Rabi frequency. The sensitivity in this manuscript shows useful application in biosensor and photovoltaic devices.