Cover Image

Homogenization studies for optical sensors based on sculptured thin films

In this thesis we investigate theoretically various types of sculptured thin film (STF) envi�sioned as platforms for optical sensing. A STF consists of an array of parallel nanowires which can be grown on a substrate using vapour deposition techniques. Typically, each nanowire has a diameter in th...

Full description

Saved in:
Bibliographic Details
Main Author: Jamaian, Siti Suhana
Format: Thesis
Language:English
Published: 2012
Subjects:
QA Mathematics
QA299.6-433 Analysis
Online Access:http://eprints.uthm.edu.my/2547/1/24p%20SITI%20SUHANA%20JAMAIAN.pdf
http://eprints.uthm.edu.my/2547/
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.uthm.eprints.2547
record_format eprints
spelling my.uthm.eprints.25472021-11-01T02:42:34Z http://eprints.uthm.edu.my/2547/ Homogenization studies for optical sensors based on sculptured thin films Jamaian, Siti Suhana QA Mathematics QA299.6-433 Analysis In this thesis we investigate theoretically various types of sculptured thin film (STF) envi�sioned as platforms for optical sensing. A STF consists of an array of parallel nanowires which can be grown on a substrate using vapour deposition techniques. Typically, each nanowire has a diameter in the range from ∼ 10−300 nm while the film thickness is . 1µm. Through careful control of the fabrication process, both the optical properties and the porosity of the STF can be tailored to order. These abilities make STFs promising for optical sensing applications, wherein it is envisaged that the material to be sensed infiltrates the void re�gion in between the parallel nanowires and hence changes the optical properties of the STF. Various homogenization formalisms can be used to estimate the constitutive parameters of the infiltrated STFs. In this thesis two different homogenization formalisms were used: the Bruggeman formalism (extended and non–extended versions) and the strong-permittivity�fluctuation theory (SPFT). These were used in investigations of the following optical–sensing scenarios: (i) Electromagnetic radiation emitted by a dipole source inside an infiltrated chiral STF. The effects of using the extended Bruggeman homogenization formalism, which takes into account the nonzero size of the component particles, were studied. (ii) Surface–plasmon– polariton waves on a metal–coated, infiltrated columnar thin film. The influences of using the extended SPFT formalism, which takes into account the nonzero size of the component particles and their statistical distributions, were explored. (iii) A metal-coated infiltrated chiral STF which supports both surface-plasmon-polariton waves and the circular Bragg phe�nomenon. The possibility of using in parallel both surface-plasmon-polariton waves and the circular Bragg phenomenon was investigated using the non–extended Bruggeman formalism. Our numerical studies revealed that the design performance parameters of the infiltrated STF are bode well for these optical–sensing scenarios. The use of inverse Bruggeman formalism was also investigated: this was found to be problematic in certain constitutive parameter regimes, but not those for optical–sensing scenarios considered in this thesis. 2012 Thesis NonPeerReviewed text en http://eprints.uthm.edu.my/2547/1/24p%20SITI%20SUHANA%20JAMAIAN.pdf Jamaian, Siti Suhana (2012) Homogenization studies for optical sensors based on sculptured thin films. Doctoral thesis, University of Edinburgh.
institution Universiti Tun Hussein Onn Malaysia
building UTHM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Tun Hussein Onn Malaysia
content_source UTHM Institutional Repository
url_provider http://eprints.uthm.edu.my/
language English
topic QA Mathematics
QA299.6-433 Analysis
spellingShingle QA Mathematics
QA299.6-433 Analysis
Jamaian, Siti Suhana
Homogenization studies for optical sensors based on sculptured thin films
description In this thesis we investigate theoretically various types of sculptured thin film (STF) envi�sioned as platforms for optical sensing. A STF consists of an array of parallel nanowires which can be grown on a substrate using vapour deposition techniques. Typically, each nanowire has a diameter in the range from ∼ 10−300 nm while the film thickness is . 1µm. Through careful control of the fabrication process, both the optical properties and the porosity of the STF can be tailored to order. These abilities make STFs promising for optical sensing applications, wherein it is envisaged that the material to be sensed infiltrates the void re�gion in between the parallel nanowires and hence changes the optical properties of the STF. Various homogenization formalisms can be used to estimate the constitutive parameters of the infiltrated STFs. In this thesis two different homogenization formalisms were used: the Bruggeman formalism (extended and non–extended versions) and the strong-permittivity�fluctuation theory (SPFT). These were used in investigations of the following optical–sensing scenarios: (i) Electromagnetic radiation emitted by a dipole source inside an infiltrated chiral STF. The effects of using the extended Bruggeman homogenization formalism, which takes into account the nonzero size of the component particles, were studied. (ii) Surface–plasmon– polariton waves on a metal–coated, infiltrated columnar thin film. The influences of using the extended SPFT formalism, which takes into account the nonzero size of the component particles and their statistical distributions, were explored. (iii) A metal-coated infiltrated chiral STF which supports both surface-plasmon-polariton waves and the circular Bragg phe�nomenon. The possibility of using in parallel both surface-plasmon-polariton waves and the circular Bragg phenomenon was investigated using the non–extended Bruggeman formalism. Our numerical studies revealed that the design performance parameters of the infiltrated STF are bode well for these optical–sensing scenarios. The use of inverse Bruggeman formalism was also investigated: this was found to be problematic in certain constitutive parameter regimes, but not those for optical–sensing scenarios considered in this thesis.
format Thesis
author Jamaian, Siti Suhana
author_facet Jamaian, Siti Suhana
author_sort Jamaian, Siti Suhana
title Homogenization studies for optical sensors based on sculptured thin films
title_short Homogenization studies for optical sensors based on sculptured thin films
title_full Homogenization studies for optical sensors based on sculptured thin films
title_fullStr Homogenization studies for optical sensors based on sculptured thin films
title_full_unstemmed Homogenization studies for optical sensors based on sculptured thin films
title_sort homogenization studies for optical sensors based on sculptured thin films
publishDate 2012
url http://eprints.uthm.edu.my/2547/1/24p%20SITI%20SUHANA%20JAMAIAN.pdf
http://eprints.uthm.edu.my/2547/
_version_ 1738581005073121280
score 13.211869

Similar Items