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Permanent link (DOI): https://doi.org/10.7939/R3W08WQ80

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

Descriptions

Other title
Subject/Keyword
lab-on-a-chip
fluorescence detection
Bragg waveguide
micro-spectrometer
Type of item
Thesis
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
Department of Electrical and Computer Engineering
Specialization
Microsystems and Nanodevices
Date accepted
2014-01-27T14:26:27Z
Graduation date
2014-06
Degree
Master of Science
Degree level
Master's
Abstract
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.
Language
English
DOI
doi:10.7939/R3W08WQ80
Rights
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).

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