DirectionalPlasmonicNanoSensors_Report

Examensarbete för masterexamen

Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12380/193037
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Type: Examensarbete för masterexamen
Master Thesis
Title: DirectionalPlasmonicNanoSensors_Report
Authors: wesäll, martin
Abstract: For the last decade plasmonic nanoparticles has been considered as promising candidates for future sensing applications. Due to their incredible ability to detect minute changes in their local dielectric environment, plasmonic nanoparticles exhibit numerous properties suitable for material and biomedical industries. General methods, which utilizes localized surface plasmon resonances (LSPR) for sensing, are based on detecting extinction resonance peak shift in order to observe changes in refractive index of the local environment. In this study we instead focus on a selfreferenced label-free sensing scheme based on directional scattering from samples consisting of asymmetric monometallic Au dimers. LSPR peak shift measurements moreover often relies on complicated and expensive measuring devices such as microscopes and spectrometers. In order to further suppress economic cost and simultaneously increase simplicity a microscope-free optical setup was designed and manufactured to perform single-wavelength experimental sensing measurements. All samples were manufactured using the hole-mask colloidal lithography method. We also present theoretical models illustrating how supreme sensitivity can be achieved, using a sensing scheme which measures ratio of intensities scattered in opposite directions from asymmetric nanostructures. Moreover experimental bulk- and local refractometric measurements are conducted to support the ability of performing biosensing.
Keywords: Nanovetenskap och nanoteknik;Grundläggande vetenskaper;Hållbar utveckling;Innovation och entreprenörskap (nyttiggörande);Nanoteknik;Nanoscience & Nanotechnology;Basic Sciences;Sustainable Development;Innovation & Entrepreneurship;Nano Technology
Issue Date: 2013
Publisher: Chalmers tekniska högskola / Institutionen för teknisk fysik
Chalmers University of Technology / Department of Applied Physics
URI: https://hdl.handle.net/20.500.12380/193037
Collection:Examensarbeten för masterexamen // Master Theses



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