Li ZhuFollow

Award Date

May 2023

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Mathematical Sciences

First Committee Member

Jichun Li

Second Committee Member

Monika Neda

Third Committee Member

Pengtao Sun

Fourth Committee Member

Hongtao Yang

Fifth Committee Member

Yi-Tung Chen

Number of Pages

142

Abstract

The Perfectly Matched Layer (PML) technique is an effective tool introduced by B´erenger [13] to reduce the unbounded wave propagation problem to a bounded domain problem. This dissertation focuses on two different PML models and their applications to wave propagation problems with Maxwell’s equation in complex media. We investigate these models using two popular numerical methods: the Finite Difference Method (FDM) in Chapters 2 and 3, and the Finite Element Method (FEM) in Chapters 4 and 5.In Chapter 2, we focus on analyzing the stability of a PML developed by B’ecache et al. [10] for simulating wave propagation in the Drude metamaterial. While this PML was originally shown to be stable through modal analysis in [11], we establish its stability using the energy method. Additionally, we develop and analyze an FDTD scheme and present numerical simulations that demonstrate the PML’s effectiveness in absorbing outgoing waves in the Drude medium. In Chapter 3, we propose and analyze a fourth-order finite difference scheme for solving Ziolkowski’s PML model [118]. While fourth-order schemes have been commonly used in solving Maxwell’s equations, few papers provide a rigorous convergence analysis. One of the key contributions of our work is to fill this gap by demonstrating the fourth-order pointwise convergence of our proposed scheme. We present numerical results to support our analysis and demonstrate the effectiveness of the Perfectly Matched Layers in absorbing outgoing waves for this PML model. In Chapter 4, our focus is on developing more efficient numerical methods for Ziolkowski’s PML model by reducing the number of unknowns. To achieve this goal, we reformulate the original model into an integro-differential form and propose two new finite element methods for solving this equivalent PML model. We provide stability and convergence analysis for both schemes and present numerical results to support our analysis and demonstrate the effectiveness of the wave absorption for this equivalent PML. In Chapter 5, we present a new variational form for simulating the propagation of surface plasmon polaritons on graphene sheets, where the graphene is treated as a thin sheet of current with effective conductivity. We propose a novel finite element method to solve this graphene model and prove discrete stability and error estimates for our proposed method. We also present numerical results to demonstrate the effectiveness of this graphene model in simulating the surface plasmon polaritons propagating on graphene sheets.

Keywords

Finite Difference Time Domain Method; Finite Element Time Domain Method; Graphene; Numerical Analysis; Perfectly Matched Layer

Disciplines

Applied Mathematics | Electromagnetics and Photonics | Engineering Physics | Other Physics | Physics

File Format

pdf

Degree Grantor

University of Nevada, Las Vegas

Language

English

Rights

IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/

Download


Share

COinS