Download the full-sized PDF of Tapered air-core Bragg waveguide spectrometers for fluorescence detection in lab-on-a-chip devicesDownload the full-sized PDF



Permanent link (DOI):


Export to: EndNote  |  Zotero  |  Mendeley


This file is in the following communities:

Graduate Studies and Research, Faculty of


This file is in the following collections:

Theses and Dissertations

Tapered air-core Bragg waveguide spectrometers for fluorescence detection in lab-on-a-chip devices Open Access


Other title
fluorescence detection
Bragg waveguide
Type of item
Degree grantor
University of Alberta
Author or creator
Drobot, Brian A
Supervisor and department
DeCorby, Ray (Electrical & Computer Engineering)
Examining committee member and department
Zemp, Roger (Electrical & Computer Engineering)
Tsui, Ying (Electrical & Computer Engineering)
DeCorby, Ray (Electrical & Computer Engineering)
Department of Electrical and Computer Engineering
Microsystems and Nanodevices
Date accepted
Graduation date
Master of Science
Degree level
This thesis describes a study on tapered air-core Bragg waveguides for use as integrated micro-spectrometers in lab-on-a-chip systems. Position-dependent cutoff of the leaky waveguide modes results in spatial dispersion of polychromatic input light. These devices may be viewed as side-coupled Fabry-Perot cavities of varying core thickness. Chip-scale spectrometers have a number of applications, including point-of-care diagnostics, biochemistry, and field-deployable threat detectors. Bragg cladding mirrors with an omnidirectional band (for TE-polarized light) between ~490 nm and ~570 nm were deposited using both e-beam evaporation and reactive sputtering. Using these claddings, tapered hollow Bragg waveguides were assembled using two different methods: buckling self-assembly and a wafer-bonding process. The tapers exhibited resolutions ranging from ~2.2 nm to ~0.8 nm, for mode orders m = 1 to m = 8. Implementing the tapers in a prototype sensing system, the fluorescence spectra of individual fluorescent beads were successfully measured over the ~70 nm wide operating range of the device.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
B. Drobot, A. Melnk, M. Zhang, T.W. Allen, and R.G. DeCorby, “Visible-band dispersion by a tapered air-core Bragg waveguide,” Optics Express, Vol. 20, No. 21, 23906-11 (2012).Brian A. Drobot, Aaron D. Melnyk, Trevor W. Allen, Ray G, DeCorby, “Tapered air-core Bragg waveguide spectrometers for lab-on-a-chip applications,” Proceedings of SPIE Vol. 8726, 87260V–87260V–7 (2013).

File Details

Date Uploaded
Date Modified
Audit Status
Audits have not yet been run on this file.
File format: pdf (Portable Document Format)
Mime type: application/pdf
File size: 11047394
Last modified: 2015:10:12 17:00:33-06:00
Filename: Drobot_Brian_Spring 2014.pdf
Original checksum: b2ac71be35d261c50642cac7baa99d9b
Well formed: true
Valid: true
File title: thesis cover page
Page count: 164
Activity of users you follow
User Activity Date