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|Document Type: ||Thesis or dissertation|
|Title: ||Tapered optical fibre sensors employing nanostructured coatings|
|Authors: ||Jarzebinska, Renata|
|Supervisors: ||James, Stephen W.|
Tatam, Ralph P.
|Issue Date: ||May-2010|
|Abstract: ||Tapered optical fibres have been manufactured, characterised and studied. These are
compact devices made from single-mode optical fibre. A system for producing tapers has
been developed, employing flame heating of the optical fibre and computer controlled
rotation stages to stretch the fibre in a controlled and repeatable fashion.
Subsequently tapered fibres were coated with nanostructured films of materials that change
their optical properties in response to an external stimulus. An investigation of the effect of
depositing chemically sensitive nano-scale films onto tapered optical fibres has been
undertaken. Three different methods of deposition were applied: Langmuir-Blodgett
technique, electrostatic-self-assembly and – for the first time - chemical grafting. Six
different films of materials were deposited onto tapered fibres: 4-[2-(4-dimethylamino-
naphtalen-1-yl)-vinyl]-1-octadecyl-quinolinium iodide (merocyanine dye),
calixresorcinarene, bilayers of poly(allyamine hydrochloride) (PAH) and anionic
tetrakis(4-sulfophenyl)porphine (TSPP), PAH and cyclodextrine, TiO2 nanoparticles
imprinted with ((1-(4-Nitrophenylazo)-2-naphthol (NPAN) compound), polyaniline
(PANI). During the deposition process the light was launched into each fibre and the
evolution of the transmission spectrum observed.
The coated tapers were subsequently investigated for their potential application as
chemical sensors: pH, red-ox, ammonia sensors. The response to a stimulus was
investigated by immersing the coated tapered fibre in an environment containing the
The properties of these devices were also used in combination other photonics concepts,
such as fibre Bragg gratings written in the tapered region of a fiber, under investigation
within the Engineering Photonics Group to develop new sensor elements.|
|Appears in Collections:||PhD and Masters by research theses (School of Engineering)|
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