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Research On The Photonic Crystal Fiber-based SPR And SERS Sensors

Posted on:2014-09-04Degree:MasterType:Thesis
Country:ChinaCandidate:P P ZhangFull Text:PDF
GTID:2298330422468259Subject:Photonics technology
Abstract/Summary:PDF Full Text Request
As the structure of photonic crystal fiber can be designed flexibly, it has many unique advantages that ordinary optical fiber does not have, and using photonic crystal fiber to design sensor is a research focus in the field of sensors. In this article, PCF based on surface plasmon resonance technology and surface enhanced raman scattering technology are theoretically and experimentally investigated. And the related experiments of PCF-SERS sensor are also carried out.The main contents and innovations can be summarized in the following points:1. Several numerical methods of PCF are outlined firstly, and the basic principles and implementation process of the finite element method are highlighted. Then the software COMSOL Multi physics based on finite element method is briefly described and the specific steps of modeling and simulation are given, this laid a theoretical foundation for the analysis of the characteristics of PCF.2. We design two new PCF-SPR sensor structures:one based on a novel grapefruit photonic ctystal fiber SPR sensor and a multi-core PCF-SPR sensor. And we simulate the sensor characteristics using the finite element method software COMSOL Multiphysics. The simulation results show that the optimized design sensor structure is very competitive in terms of biological, chemical and industrial applications and having great development prospects.3. We have numerical simulated the SERS effect of three common nano particles: gold balls、gold nanorods and SiO2core Au shell type compound nanometer ball and drew the following conclusion:1) resonance peaks produce red shift with the size of nano particle increasing, therefor, for a given excitation wavelength, choosing the appropriate size of nanopartilces can get higher Raman electic field enhancement;2) raman enhancement factor of two nanoparticles coupling have several orders of magnitude higher effect than single nanoparticles, and high enhancement factor is generally more obvious when the nanoparticles is in hours, the enhancement effect will weaken gradually when the spacing is more than10nm;3) there will appear a plurality of resonance peaks when the core-shell ratio of SiO2core Au shell type compound nanometer ball becomes large, and the reasonable control of its core-shell size can make the resonance peak of the gloden nano shell appeared in near infrared region.4. We have proposed a liquid core PCF-SERS probe and numerical simulated its sensing performance, the modeling results indicate that such a liquid core PCF can greatly improve the utilization efficiency of the excitation light and the excitation light can fully act on the test sample. Finally, we use this PCF-SERS probe to test the melamine solution and have achieved good results.
Keywords/Search Tags:photonic crystal fiber, finite element method, surface plasmonresonance, surface enhanced Raman scattering
PDF Full Text Request
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