Modal Analysis of Triangle-Shaped and Silver-Nanowire Waveguides Using a Full-Vectorial Imaginary-Distance Finite-Element Beam Propagation Method
Date Issued
2015
Date
2015
Author(s)
Chen, Hsiang-Peng
Abstract
Modal analysis of surface plasmon polariton (SPP) waveguides using an in-house developed finite-element imaginary-distance beam propagation method (FE-ID-BPM) is discussed in this thesis. We mainly analyze the modal characteristics of triangle-shaped and silver nanowire waveguides. The effective refractive indices, propagation lengths, and mode-field profiles are calculated for different parameters and structures. For the triangle-shaped waveguides, we discuss the propagation characteristics of the two different Λ-type and V-type structures, aiming at the investigation of structures with smaller corner angles relative to those reported in the literature. We show the effective index and propagation length versus the operating wavelength for corner angles of 25⁰, 20⁰, and 15⁰, and compare the degrees of confinement and losses for different wavelengths and corner angles. For the silver nanowires, we discuss a nanowire immersed in a medium matrix and that with a supported substrate. For different operating wavelengths and radii of the nanowires, we discuss the propagation characteristics of the guiding modes. The real part of the effective index and the propagation length are discussed in detail. Besides the guiding modes, we find there exists a leaky mode in the substrate-supported nanowire.
Subjects
finite-element imaginary-distance beam propagation method (FE-IDBPM)
surface plasmon polariton (SPP)
triangle-shaped waveguides
silver nanowires
leaky modes
Type
thesis
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ntu-104-R02941099-1.pdf
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