Infrared Dielectric Characteristics Of Porous Binary And Ternary Iii-Nitrides Heterostructures

Porosity and composition dependence of infrared (IR) dielectric function of wurtzite III-nitrides are explored theoretically and experimentally. “Suspension-like” (i.e., porous GaN) and “solution-like” (i.e., InxGa1-xN) mixture are employed to investigate porosity and composition dependence of IR di...

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Main Author:	Yew, Pauline
Format:	Thesis
Language:	English
Published:	2018
Subjects:	QC1 Physics (General)
Online Access:	http://eprints.usm.my/47818/1/PAULINE%20YEW%20-%20INFRARED%20DIELECTRIC%20CHARACTERISTICS.pdf
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spelling	my-usm-ep.478182020-10-28T06:43:33Z Infrared Dielectric Characteristics Of Porous Binary And Ternary Iii-Nitrides Heterostructures 2018-08 Yew, Pauline QC1 Physics (General) Porosity and composition dependence of infrared (IR) dielectric function of wurtzite III-nitrides are explored theoretically and experimentally. “Suspension-like” (i.e., porous GaN) and “solution-like” (i.e., InxGa1-xN) mixture are employed to investigate porosity and composition dependence of IR dielectric function respectively. Although many effective medium theories (EMTs) are available in literature, selection of appropriate EMT to describe the effective dielectric response for “suspension-like” mixture remains challenging and ambiguous. Therefore, an in-depth study on the effective dielectric properties for two-component mixtures which have four possible combinations of dielectric functions is performed. A comprehensive guideline for selecting the EMT to describe the effective dielectric behaviour of “suspension-like” mixture is proposed. Subsequently, polarized IR reflectance measurements of a set of porous GaN samples (PGaN) are performed to investigate the best EMT in describing the PGaN system as well as the impact of porosity on effective dielectric function. The reflectance spectra of PGaN can be fully described by factorized-Rayleigh (Ra) model which is developed for the first time to account for the damping of Fröhlich modes. Two weak Fröhlich modes are detected in the s-polarized IR reflectance spectra of PGaN at 710 cm-1 and 730 cm-1. This implies that two additional surface phonon polariton (SPhP) modes are expected to appear in p-polarized IR attenuated total reflection spectra of PGaN. Besides, a red shift of SPhP mode of PGaN with increasing porosity can be predicted using factorized-Ra model. 2018-08 Thesis http://eprints.usm.my/47818/ http://eprints.usm.my/47818/1/PAULINE%20YEW%20-%20INFRARED%20DIELECTRIC%20CHARACTERISTICS.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Sains Fizik
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	QC1 Physics (General)
spellingShingle	QC1 Physics (General) Yew, Pauline Infrared Dielectric Characteristics Of Porous Binary And Ternary Iii-Nitrides Heterostructures
description	Porosity and composition dependence of infrared (IR) dielectric function of wurtzite III-nitrides are explored theoretically and experimentally. “Suspension-like” (i.e., porous GaN) and “solution-like” (i.e., InxGa1-xN) mixture are employed to investigate porosity and composition dependence of IR dielectric function respectively. Although many effective medium theories (EMTs) are available in literature, selection of appropriate EMT to describe the effective dielectric response for “suspension-like” mixture remains challenging and ambiguous. Therefore, an in-depth study on the effective dielectric properties for two-component mixtures which have four possible combinations of dielectric functions is performed. A comprehensive guideline for selecting the EMT to describe the effective dielectric behaviour of “suspension-like” mixture is proposed. Subsequently, polarized IR reflectance measurements of a set of porous GaN samples (PGaN) are performed to investigate the best EMT in describing the PGaN system as well as the impact of porosity on effective dielectric function. The reflectance spectra of PGaN can be fully described by factorized-Rayleigh (Ra) model which is developed for the first time to account for the damping of Fröhlich modes. Two weak Fröhlich modes are detected in the s-polarized IR reflectance spectra of PGaN at 710 cm-1 and 730 cm-1. This implies that two additional surface phonon polariton (SPhP) modes are expected to appear in p-polarized IR attenuated total reflection spectra of PGaN. Besides, a red shift of SPhP mode of PGaN with increasing porosity can be predicted using factorized-Ra model.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Yew, Pauline
author_facet	Yew, Pauline
author_sort	Yew, Pauline
title	Infrared Dielectric Characteristics Of Porous Binary And Ternary Iii-Nitrides Heterostructures
title_short	Infrared Dielectric Characteristics Of Porous Binary And Ternary Iii-Nitrides Heterostructures
title_full	Infrared Dielectric Characteristics Of Porous Binary And Ternary Iii-Nitrides Heterostructures
title_fullStr	Infrared Dielectric Characteristics Of Porous Binary And Ternary Iii-Nitrides Heterostructures
title_full_unstemmed	Infrared Dielectric Characteristics Of Porous Binary And Ternary Iii-Nitrides Heterostructures
title_sort	infrared dielectric characteristics of porous binary and ternary iii-nitrides heterostructures
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Sains Fizik
publishDate	2018
url	http://eprints.usm.my/47818/1/PAULINE%20YEW%20-%20INFRARED%20DIELECTRIC%20CHARACTERISTICS.pdf
_version_	1747821834857873408

Infrared Dielectric Characteristics Of Porous Binary And Ternary Iii-Nitrides Heterostructures

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