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Research On The Regulation Characteristics Of Multi-band Surface Plasmon Resonance Sensing Structure

Posted on:2019-03-03Degree:MasterType:Thesis
Country:ChinaCandidate:Y S WuFull Text:PDF
GTID:2348330542493932Subject:Electromagnetic field and microwave technology
Abstract/Summary:PDF Full Text Request
Surface plasmon resonance(SPR)sensing has the characteristics of high sensitivity,rapid detection and label-free.It is widely used in medical detection,environmental testing,food safety,biochemical sensing and other fields.In the field of surface plasmon resonance sensing,due to its unique local surface plasmon resonances(LSPR)properties and the tunability of the planar optical waveguide modes,periodic metallic nanostructures can be distinguished from traditional planar.The unique properties of metal film structure,become an SPR sensing structure of an important research direction.we aimed at the requirement of high integration and multi-band detection of SPR sensors,a metal nanoparticle array with a planar optical waveguide composite structure are proposed.The structure can effectively generate multiple resonance peaks and achieve multi-band detection.The sensitivities and figure of merit of multiple resonance peaks were simulated and the mechanism of the composite structure was studied and analyzed.The main contents are as follows:Firstly,the physical mechanism of multiple resonance peaks between the metal nanoparticle with the planar optical waveguide composite is discussed by using the finite-difference time-domain(FDTD)algorithm,the planar optical waveguide theory and the electromagnetic theory of surface plasmon.The effects of multiple resonance peak electric field distribution.The optimal ratios of the long axis to the short axis of the two kinds of particles(rhombus and ellipse)were calculated the sensing characteristics of the two metal nanoparticle arrays with the planar optical waveguide composite structure were compared.The elliptical nanoparticle array with planar optical waveguide composite structure has higher sensitivity and figure of merit and narrower full width at half maximum.Secondly,based on the above basic research,the regulation characteristics of the composite structure of the elliptical nanoparticle array with the planar optical waveguide are further analyzed.The regulation characteristics of the composite structure was investigated by changing the thickness of the waveguide layer and the period of the metal nanoparticle arrays respectively.The results show that as the waveguide layer thickness increases,more waveguide modes will be supported in the waveguide layer,more resonance peaks will be generated in the transmission spectrum,and when the period of the metal nanoparticle array in the y-axis direction increases,the position of resonance wavelength will be adjusted.In summary,the research results are able to provide a theoretical guide for the design of multi-band SPR sensors substrate.
Keywords/Search Tags:Local surface plasmon resonance, Planar optical waveguide theory, Finite-difference time-domain algorithm, Metal nanoparticle arrays, Multi-band sensing characteristics
PDF Full Text Request
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