Multiple Scattering Analysis of Circular-Cylinder Systems
Date Issued
2009
Date
2009
Author(s)
Shang, Wen-Tsung
Abstract
Surface plasmon resonance is an extraordinary energy enhancement phenomenon which occurs on the interface between dielectric and metal. In the two-dimensional (2-D) case, such resonance is only excited by the transverse-magnetic (TM) polarized wave with which the magnetic field is perpendicular to the 2-D plane. This research mainly concerns the scattering phenomena of 2-D metallic nanocylinders simulated using the multiple scattering method. The multiple scattering method is an analytical solution method for analyzing scattering by cylinder structures, which can provide fast calculations and accurate results.e investigate scattering by nano-cylinders with real metallic material in the wavelength regime of 300 nm-800 nm. For a single silver cylinder, the dependence on the cylinder radius of the intensity of the scattered field, the value of the scattering cross section (SCS), and the wavelength at which the maximum field value occurs is studied. For two silver cylinders, the scattering is seen to be affected by the direction of incident wave, the distance between the two cylinders, and the radius of cylinders. By increasing the number of cylinders in a single row at normal incidence, the scattering approaches a convergent behavior if the distance between adjacent cylinders is large enough.or waves incident parallelly onto a row of cylinders, the waveguiding behavior is particularly paid attention to. For multi-row structure, the effect on the SCS of the distance between cylinder rows and the gap size between columns is investigated in detail.e also investigated characteristics of 2-D photonic crystals (PCs) composed of circular cylinders. The plane-wave expansion (PWE) method is employed to obtain the photonic bandgaps (PBGs) for triangular lattice and square lattice. Then the multiple scattering method is used to obtain transmittance spectra for finite PCs for comparison with the PWE method calculated PBGs. Examples of PC cavity and line defect are also discussed.
Subjects
Surface plasmon resonance
Multiple scattering method
Scattering cross section
Cylinder
2-D photonic crystal
Type
thesis
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