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dc.contributor.advisorBlaikie, Richard
dc.contributor.advisorStephen, Sowerby
dc.contributor.authorHensley, Robert Noah
dc.date.available2019-06-28T03:08:16Z
dc.date.copyright2019
dc.identifier.citationHensley, R. N. (2019). Optical Sensitivities of Three Flow-through Porous Plasmonic Sensors (Thesis, Doctor of Philosophy). University of Otago. Retrieved from http://hdl.handle.net/10523/9423en
dc.identifier.urihttp://hdl.handle.net/10523/9423
dc.description.abstractThe research studies presented in this thesis include analysing the sensitivity of three different plasmonic substrates with arrays of open-ended nanometric holes. The first plasmonic nanohole array based sensor consisted of commercially available transmission electron microscopy grids with well-defined, periodic arrays of nanoholes etched through a thin silicon nitride membrane. These grids were coated with silver and used to detect changes to the surrounding bulk fluid via optical transmission spectroscopy. The second plasmonic nanohole array based sensor was similar in structure to the first sensor, but consisted of a silicon chip with multiple well-defined, periodic nanohole arrays suspended on a thin, silicon nitride membrane coated with silver. The surface sensitivities of these chips were measured using optical transmission spectroscopy by stacking adlayers of films to the surface of the sensor. Through these experiments with periodic nanohole arrays, the surface sensitivity was shown to be highly variable and dependent upon the geometry of the nanohole array. Finally, a third plasmonic sensor was fabricated and tested which was based on commercially available porous anodic alumina filters. The pores of this filter were longer, less ordered and non-periodic, yet the filters were shown to be suitable for detecting an analyte at parts per trillion levels after evaporatively coating the filters with silver. Both simulations and experiments using optical transmission spectroscopy were used to understand and identify the variables that affect the sensitivity of these three platforms.
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherUniversity of Otago
dc.rightsAll items in OUR Archive are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectplasmonics
dc.subjectplasmonic sensing
dc.subjectnanohole arrays
dc.subjectsurface plasmon polaritons
dc.subjectlocalised surface plasmons
dc.subjecttransmission spectroscopy
dc.subjectrefractive index sensing
dc.subjectnanoparticles
dc.subjectsilver
dc.subjectthermal evaporation
dc.subjectnanofabrication
dc.subjectnanoholes
dc.subjectTEM grids
dc.subjectmultiplexed nanohole array sensing
dc.subjectsurface sensitivity
dc.subjectfilters
dc.subjectporous anodic alumina
dc.subjectporous anodic aluminium oxide
dc.subjectthin films
dc.titleOptical Sensitivities of Three Flow-through Porous Plasmonic Sensors
dc.typeThesis
dc.date.updated2019-06-28T00:32:50Z
dc.language.rfc3066en
thesis.degree.disciplinePhysics
thesis.degree.nameDoctor of Philosophy
thesis.degree.grantorUniversity of Otago
thesis.degree.levelDoctoral
otago.openaccessOpen
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