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Permanent link (DOI): https://doi.org/10.7939/R37P8TT2M

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Optical Properties of Anatase and Rutile Phase TiO2 Nanotubes Open Access

Descriptions

Other title
Subject/Keyword
titanium dioxide
polarized light
birefringence
anatase
ellipsometry
refractive index
nanotube arrays
rutile
anisotropy
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Zhang, Yun
Supervisor and department
Kar, Piyush (Electrical and Computing Engineering)
Shankar, Karthik (Electrical and Computing Engineering)
Examining committee member and department
Chung, Hyun-Joong (Chemical and Materials Engineering)
DeCorby, Ray
Department
Department of Electrical and Computer Engineering
Specialization
Microsystems and Nanodevices
Date accepted
2017-09-29T11:16:27Z
Graduation date
2017-11:Fall 2017
Degree
Master of Science
Degree level
Master's
Abstract
Nanofabricated optically anisotropic uniaxial thin films with deep submicron feature sizes are emerging as potential platforms for low-loss all-dielectric meta-materials and for Dyakonov surface wave-based sub-wavelength optical confinement and guiding at interfaces with isotropic media. In this context, we fabricated anatase and rutile phased titania nanotube arrays (TNTAs) and investigate the optical properties of one such uniaxial platform, namely self-organized TNTAs grown by the bottom-up nanofabrication process of electrochemical anodization on silicon wafer substrates. Transmittance spectra measurement was used to investigate the isotropic properties of TNTAs, refractive index was extracted from the spectra fringes. Variable angle spectroscopic ellipsometry was used to investigate the optical anisotropy in two phases of TNTAs. One phase is anatase and the other phase contains a mixture of anatase and rutile. Both kinds of TNTAs were found to have positive birefringence (n). The experimentally measured anisotropy in the refractive index of the TNTAs was compared with model-predictions of two different effective medium approximations incorporating the uniaxial geometry. The measured value of n for anatase-phase TNTAs exceeded that of bulk anatase single crystals, indicating the potential of nanostructured dielectrics to outperform dielectric crystals of the same material with respect to the magnitude of the achievable directional refractive index contrast.
Language
English
DOI
doi:10.7939/R37P8TT2M
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
Zhang, Y., Farsinezhad, S., Wiltshire, B., Kisslinger, R., Kar, P. and Shankar, K., 2017. Optical anisotropy in vertically oriented TiO2 nanotube arrays. Nanotechnology, 28(37).Kar, P., Zhang, Y., Farsinezhad, S., Mohammadpour, A., Wiltshire, B.D., Sharma, H. and Shankar, K., 2015. Rutile phase n-and p-type anodic titania nanotube arrays with square-shaped pore morphologies. Chemical Communications, 51(37), pp.7816-7819.

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