We propose ultra compact Plasmonics based refractive Index sensor. The sensor structure includes a MIM (Metal- Insulator-Metal) waveguide, a pair of rectangular stub and a pair of taper. Two corresponding structures are simulated using Finite difference time domain (FDTD) method of opti-FDTD tool. The sensitivity of the structures is compared and it is concluded that increasing sensing area increases the sensitivity accordingly. The principle of sensing is based on estimation of refractive index by calculating shift in resonance. The stub and taper both are filled with material having unknown refractive index.
Plasmonics, Metal-Insulator-Metal, Finite difference time domain method, sensitivity