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Characterization of the spectral properties of a reflective fiber optic LSPR sensor probe4
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

LSPR is an optical phenomenon which is used for a number of applications such as bio-sensing and medical diagnostics.  These methods have the potential to detect early indications of disease and has over the last few years been proven promising due to its high sensitivity and the small amount of reagents being

used.

This thesis presents a setup using spectrometer and light source focused primarily within visible light, and is coupled with multimode fibers attached to  an  index  matching  gel  and  a  sensor  segment  using  a  2x2  coupler.   The sensor is comprised of a hydrogel representing a Fabry-perot cavity with gold nanorods immobilized within.  Light is propagated through optical fibers into

the hydrogel and the light scattering back is measured with the spectrometer. LSPR measurements were performed on multiple pre-gel solutions with differing polymer density and the spectral data gathered were analyzed.  Results showed an  increase  in  FWHM  and  a  slight  red  shift  when  increasing  the  polymer

hydrogel density from 5 to 10 wt%.  A further increase in polymer density led to periodic signals dominating the spectra.  It is argued that this may be caused by interference on the signal originating from a gap in fiber-gel interface.  Or that it is caused by reflections from gel-liquid interface mixing with reflections from fiber-gel interface due to the increased reflectivity higher polymer densities

provide.

Place, publisher, year, edition, pages
2019. , p. 42
Keywords [en]
LSPR, Sensor
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-38272Local ID: EL-V19-A2-043OAI: oai:DiVA.org:miun-38272DiVA, id: diva2:1388304
Subject / course
Electronics EL1
Educational program
Masterprogram i elektroniksystem och instrumentation TEIAA 120 AV
Supervisors
Examiners
Available from: 2020-01-24 Created: 2020-01-24 Last updated: 2020-01-24Bibliographically approved

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