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Investigation On The Photonic Crystal Fiber-based Surface Plasmon Resonance Sensor

Posted on:2013-07-03Degree:MasterType:Thesis
Country:ChinaCandidate:X Y FuFull Text:PDF
GTID:2248330362461594Subject:Photonics technology
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Detection and analysis of biological materials are widely needed in many important areas in production and daily life, such as medicine, environment, biotechnology, and food, etc.Surface plasmon resonance-based biochemical sensing is currently the most advanced real-time and label-free detection technology, and has great potential for application in the field of biological material detection. As photonic crystal fibers have many excellent features, sensors made of them are now hot research topics in the sensing area, and photonic crystal fiber-based surface plasmon resonance sensor is one of its important directions for future development. Therefore, it is of great significance to study the photonic crystal fiber based surface plasmon resonance sensors.In the studies of surface plasmon resonance sensors based on photonic crystal fiber, a kind of finite element software named COMSOL Multiphysics is used to build fiber models and analyze sensor characteristics. The sensor structures are gradually optimized and related experiments and analysis are also carried out.The main contents and innovation points of this diploma work are as follows:1) Basic concepts, characteristics and development of PCF and SPR are introduced comprehensively, and then the basic principles of SPR sensor are analyzed in detail. All of these provide the relevant theoretical basis for the design and application of SPR sensors.2) Silver nanowires filled photonic crystal fibers are proposed in this paper to achieve surface plasmon resonance sensors and overcome the complicacy and difficulty of holes coating in the photonic crystal fiber. Optical field distributions of these fibers at different wavelengths are calculated and simulated using the finite element method (FEM), and the sensing properties are discussed in both areas of resonant wavelength and intensity detection. Numerical simulation results show that carefully designed structure of the sensor can get an excellent effect, with both spectral and intensity sensitivity in the range of 4×10-5~5×10-5RIU, better than the similar structures coated with metal film, and the fabrication is expected to be simplified.3) From the point of view of practical utility, microstructured Polymer Optical Fiber (mPOF) made of polymethyl methacrylate (PMMA) with the cladding having only one layer of air holes near the edge of the fiber is designed and proposed to be used in surface plasmon resonance sensors in this paper. Instead of coating or filling of the holes, which is quite demanding and difficult, nanoscale silver metal film is deposited on the outer side of the fiber, making the real time detection with high sensitivity easily realized. It is very convenient for repeated testing by using this sensing system, voiding a lot of trouble. The sensor also has many other excellent features, such as ease of use, convenient reuse, and high reliability, stability and sensitivity, etc.4) In addition to a lot of theoretical work and calculations, exploratory investigation on the related experiment is carried out. Through continuous optimization of experimental program, some technical difficulties are overcome and good preliminary results are obtained.
Keywords/Search Tags:Photonic crystal fiber, surface-plasmon-resonance, sensor, finite element method
PDF Full Text Request
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