Parameter Optimization of Optical Materials and Investigation of Surface Plasmon Polariton (SPP) Propagation in Plasmonic Waveguide

Abstract

When free electrons inside the metal get affected, they start to oscillate. The movement of this oscillation inside the metal is called plasmon. The excitation can be done by exposing metal to a photon. Surface Plasmon-Polarition is formed when coupling between a plasmon inside the metal and photon outside the metal happens, and they travel at the same speed. SPPs can be used as an alternative medium for transmitting signals as it can overcome the light diffraction limit. But the main limitation of SPP is higher propagation loss in metal and short propagation distance not exceeding micrometers. The main goal of this thesis is to optimize the modeling parameters for several optically valued materials and analyze their performance in FDTD. Lorentz model and modified Lorentz model parameter of several optically valued material has been optimized using large scale nonlinear algorithm. SPP propagation characteristics through dielectric-metal-dielectric waveguide have been investigated to analyze the performance of one of the optimized dielectric material.