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
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-uthm-ep.2547
record_format	uketd_dc
spelling	my-uthm-ep.25472021-11-01T02:42:34Z Homogenization studies for optical sensors based on sculptured thin films 2012 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 http://eprints.uthm.edu.my/2547/ http://eprints.uthm.edu.my/2547/1/24p%20SITI%20SUHANA%20JAMAIAN.pdf text en public phd doctoral University of Edinburgh School of Mathematics
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
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
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
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
granting_institution	University of Edinburgh
granting_department	School of Mathematics
publishDate	2012
url	http://eprints.uthm.edu.my/2547/1/24p%20SITI%20SUHANA%20JAMAIAN.pdf
_version_	1747830966116679680

Homogenization studies for optical sensors based on sculptured thin films

Similar Items