The sensing characteristics of plasmonic waveguide with rectangular stub and taper

We have analyzed and simulated a two-dimensional MIM (Metal-Insulator-Metal) waveguide based sensor which consists a rectangular stub, and a taper. This device is designed and simulated numerically by Finite difference time domain (FDTD) method. The structure used to sense a refractive index of unknown material filled in taper and stub by detecting the resonance condition. The refractive index sensitivity and temperature sensitivity are analyzed for the proposed structure. The results show the linear relationship of dip position (resonant wavelength) and the refractive index of a material which is to be sensed. It also shows linear behavior with ambient temperature. In this given structure, we achieve RI sensitivity 1240 nanometer RIU
^-1
and temperature sensitivity is 0.488nanometer/°C. For 0.01 resolution of a detection device, the sensitivity resolution can reach as high as 0.80×10
^-5
.