Terahertz microjets for spectroscopy on the subwavelength scale
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Mitchell, Michael Eric
issued: 2022-08-18T22:26:49Z
issued: 2022
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: Terahertz radiation, given its unique location in the electromagnetic spectrum between radio-frequency and infrared radiation, has been highly regarded for its potential of non-invasive spectroscopy. The long wavelengths and low photon energies of terahertz radiation allow for the measurement of the rotational and vibrational modes of cellular tissue without damaging the cells themselves. However, the long wavelengths inherent to THz radiation restrict the focal spot sizes and therefore limit the size of samples that can be analyzed with THz spectroscopy systems. Spatial resolution has been a long-standing issue for THz spectroscopy systems, especially for the long wavelengths of the low frequency (0.3-to-0.7) THz band, being the focus of this thesis. The thesis highlights the validity, through theoretical and experimental testing, of using dielectric spheres to focus THz radiation to a scale that improves the spatial resolution of conventional THz spectroscopy systems. The dielectric spheres focus the THz radiation into so-called “THz microjets”, which can achieve subwavelength focusing over a broad-bandwidth. A complete optimization of the dielectric sphere, both in terms of size and material parameters, is undertaken. Optimal dielectric spheres are then manufactured out of custom THz microcomposite materials and experimentally characterized in terms of the focusing performance. Finally, the dielectric spheres are demonstrated in a spectroscopic application to show the improvement in resolution.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/82415
note: Terahertz Microjets for Spectroscopy on the Subwavelength Scale by Michael Eric Mitchell B.A.Sc., The University of British Columbia, 2020 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF Master of Applied Science in THE COLLEGE OF GRADUATE STUDIES (Electrical Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) August 2022 © Michael E. Mitchell, 2022 ii The following individuals certify that they have read, and recommend to the College of Graduate and Studies for acceptance, a thesis/dissertation entitled: Terahertz Microjets for Spectroscopy on the Subwavelength Scale submitted by Michael Mitchell in partial fulfillment of the requirements for the degree of Master of Applied Science Examining Committee: Dr. Jonathan Holzman, School of Engineering Supervisor Dr. Christopher Collier, School of Engineering Supervisory Committee Member Dr. Thomas Johnson, School of Engineering Supervisory Committee Member Dr. Alex Hill, Irving K. Barber Faculty of Science External Examiner iii Abstract Terahertz radiation, given its unique location in the electromagnetic spectrum between radio-frequency and infrared radiation, has been highly regarded for its potential of non-invasive spectroscopy. The long wavelengths and low photon energies of terahertz radiation allow for the measurement of the rotational and vibrational modes of cellular tissue without damaging the cells themselves. However, the long wavelengths inherent to THz radiation restrict the focal spot sizes and therefore limit the size of samples that can be analyzed with THz spectroscopy systems. Spatial resolution has been a long-standing issue for THz spectroscopy systems, especially for the long wavelengths of the low frequency (0.3-to-0.7) THz band, being the focus of this thesis. The thesis highlights the validity, through theoretical and experimental testing, of using dielectric spheres to focus THz radiation to a scale that improves the spatial resolution of conventional THz s…
has type: Thesis/Dissertation
date issued: 2022-09
is shown at: 10.14288/1.0417426
language: eng
degree discipline: Electrical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Holzman, Jonathan
type: Text
identifier URI: http://hdl.handle.net/2429/82415