Finite-Difference Time-Domain Analysis of Light Scattering and Guiding in Two-Dimensional Nano-Plasmonic Structures
Date Issued
2009
Date
2009
Author(s)
Wang, Chen-Yu
Abstract
Abstractn this research, a two-dimensional (2-D) finite-difference time-domain (FDTD)nalysis method is applied to study the coupling between nano-plasmonic cylindersnd mode characteristics 1-D nano-plasmonic waveguides. The Drude model foretallic material dispersion is implemented into the FDTD algorithm along withhe dispersive uniaxial perfectly matched layer (UPML) as the absorbing boundaryondition for the computational domain. For the modeling of the curved surfaces forhe dispersive materials, we first compare the index-average scheme with the conformal scheme. We then apply the conformal scheme to analyze the total scatteringross section (TSCS) of the nano-plasmonic cylinders. The relation between theear field intensity and the TSCS of 1-D cylinder arrays are discussed. We calculatehe TSCS and the near field intensity by changing the size of the cylinder radius,he distance between the neighboring cylinders, and the direction of the incidenceave. Rather than applying frequency-domain methods, we try to use the FDTDethod to analyze the guiding conditions for 1-D nano-plasmonic cylinder and filmrrays. For the cylinder arrays, we compare the results calculated by the FDTDethod with those by the finite-element method (FEM) in our group. For the filmrrays, we vary the thickness of the films and observe the change of the dispersionurves and magnetic field distributions of each guided mode.
Subjects
Cy Wang
FDTD
Nano-Plasmonic
Type
thesis
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