Analysis of Dielectric Pipe Waveguides and Plasmonic Slot Waveguides Using the Finite-Difference Frequency-Domain Method
Date Issued
2014
Date
2014
Author(s)
Chang, Min-Hsiang
Abstract
In this thesis, the full-vectorial finite-difference frequency-domain (FDFD) method based on Yee''s mesh is utilized to analyze optical waveguides. The perfect matched layer (PML) is employed as the absorbing boundary of the computational window in this FDFD solver. Moreover, the FDFD model adopts two approximation methods for dealing with dielectric interfaces: the stair-case approximation method and the index average scheme.
Effective indices and attenuation constants are calculated for pipe waveguides with different forms of the core region at terahertz frequencies, such as circular, semi-circular, quarter-circular, square, and 24 sided polygonal pipe waveguide.
Fano resonances, which are caused by the coupling between the core modes and the cladding modes, are observed inside transmission bands in the above-mentioned structures.
As for the subwavelength plasmonic slot waveguide, its basic characteristics for various slot widths, film thicknesses, radii of rounded edges, and finite strip widths are analyzed and discussed. The effect of some parameters of calculation on the accuracy of the numerical results is also examined.
Moreover, by ignoring the material loss of the metal in both symmetric and asymmetric slot waveguides, the possible leakage characteristics are investigated.
Subjects
有限差分頻域法
光波導
管狀波導
槽形電漿子波導
Type
thesis
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