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Permanent link (DOI): https://doi.org/10.7939/R3X34N071

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Fabrication of visible range hollow Bragg waveguides Open Access

Descriptions

Other title
Subject/Keyword
Waveguides
Integrated optics
Bragg reflectors
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Melnyk, Aaron D
Supervisor and department
Dr. Ray DeCorby (Electrical and Computer Engineering)
Examining committee member and department
Dr. Vien Van (Electrical and Computer Engineering)
Dr. Frank Hegmann (Physics)
Department
Department of Electrical and Computer Engineering
Specialization
Photonics and Plasmas
Date accepted
2016-07-18T11:43:08Z
Graduation date
2016-06:Fall 2016
Degree
Master of Science
Degree level
Master's
Abstract
This thesis describes the fabrication and characterization of visible-range hollow Bragg waveguides. A wafer bonding method was first utilized to fabricate tapered hollow Bragg waveguides, which can function as the dispersive element of an integrated spectrometer. Etched channels coated with Bragg reflector claddings enabled three-dimensional guiding. These prototypes were used to assess the spectroscopic sensing capability of the waveguides, and in particular their potential for integration into microfluidic sensing systems. The emission spectra of fluorescent microspheres were extracted, with an experimentally determined resolution as low as 0.9nm, and the results were shown to be in good agreement with measurements made by a commercial spectrometer. Hollow waveguides were subsequently fabricated by controlled thin film buckling. Lithographically patterned areas of a low-adhesion material were embedded between matching Bragg reflectors. Heating the samples induced the buckling of the compressively stressed upper cladding over the regions defined by the low-adhesion layer. Ta2O5/SiO2 multilayers combined with a fluorocarbon-based low-adhesion layer were found to produce buckle features consistent with the morphology predicted by elastic buckling theory. Device yield was as high as 60% and waveguide loss was as low as 2.6dB/cm at 543nm wavelength. These devices have potential applications in optofluidic microsystems as well as in fundamental physics studies.
Language
English
DOI
doi:10.7939/R3X34N071
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
A. Melnyk, M. H. Bitarafan, T. W. Allen, and R. G. DeCorby, "Air gap resonant tunneling bandpass filter and polarizer," Opt. Lett. 41, 1845–1848 (2016).A. Melnyk, C. A. Potts, T. W. Allen, and R. G. Decorby, "Visible range hollow waveguides by guided buckling of Ta2O5/SiO2 multilayers," Appl. Opt. (in press, 2016).A. Melnyk, T. Thiessen, B. Drobot, T. Allen, and R. G. Decorby, "Tapered air-core Bragg waveguides for spectrally resolved fluorescence detection on a chip," in Frontiers in Optics 2014 (2014), p. FW4B.4.

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