Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/127171
Type: Thesis
Title: Optical fibre cavities for sensors and lasers
Author: Xie, Liushun
Issue Date: 2020
School/Discipline: School of Physical Sciences
Abstract: Specialty optical fibres provide opportunities for light-matter interactions using nanolitre samples. In this thesis, optical microcavities using specialty fibre have been fabricated and tested for both sensing and laser applications. Optical fibre sensors with multiplexing ability are proposed and demonstrated based on Fabry-Pérot interferometers formed by serially splicing C-shaped fibre between single mode optical fibres. The multiplexing ability is demonstrated by filling different NaCl solutions into the separate cavities in a dual cavity system. Demultiplexing is achieved using Fourier techniques and the results show minimal crosstalk between the two interferometers. The dual-cavity interferometric sensor was then applied to biochemical sensing by utilizing polyelectrolyte layer by layer self-assembly followed by the biotin-streptavidin binding mechanism. The proposed sensor solves an important problem in biochemical sensing by providing an ability to simultaneously measure a negative control, critical for reducing false positive measurements. This work was published in IEEE Sensors Journal and was presented at the 2018 Australian Conference on Optical Fibre Technology. The second part of the thesis describes the use of C-shaped fibres and exposed core microstructured optical fibres to create a microfluidic dye laser. The aim is to create a single transverse mode fibre laser with visible wavelength emission using microfluidics to solve the problem of photobleaching of dye lasers. The C-shaped fibre dye laser is based on a Fabry-Pérot cavity while the exposed core fibre provides a mechanism to operate with a guided mode where the evanescent field can interact with the gain medium. In both cases, the optical pumping was achieved using a pulsed Nd:YAG laser at 532 nm and the gain medium is rhodamine B solution. An analysis of the feasibility of both approaches is given as well as preliminary results.
Advisor: Ebendorff-Heidepriem, Heike
Warren-Smith, Stephen
Nguyen, Linh
Dissertation Note: Thesis (MPhil) -- University of Adelaide, School of Physical Sciences, 2020
Keywords: Optical fibre sensing
dye laser
specialty fibres
Provenance: This electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exceptions. If you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at: http://www.adelaide.edu.au/legals
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