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Research On Design Optimization And Characteristic Of PCF Based On SPR

Posted on:2020-07-27Degree:MasterType:Thesis
Country:ChinaCandidate:W Q SuFull Text:PDF
GTID:2428330572991733Subject:Instrument Science and Technology
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In recent years,photonic crystal fiber?PCF?based on surface plasmon resonance?SPR?has attracted much attention because of its excellent sensing performance,and it shows great application potentials in various felds such as life sciences,drug screening,molecular recognition and immunoassay.In this thesis,based on the principle of PCF-SPR sensing,three types of PCF-SPR sensors are designed by using COMSOL Multiphysics numerical simulation software based on finite element method from the perspective of structural innovation and method innovation,and their structural parameters and sensing characteristics are analyzed systematically.Symmetrical dual D-shape photonic crystal fibers for surface plasmon resonance sensing are designed.The performance of the sensor is remarkably enhanced by the directional power coupling between the two fibers.We study the influence of the structural parameters on the performance of the sensor as well as the relationship between the resonance wavelengths and analyte refractive indexes between 1.36 and 1.41.An average spectral sensitivity of 14660nm/RIU can be achieved in this sensing range and the corresponding refractive index resolution is 6.82×10-6 RIU.The characteristics of a single D-shape PCF-SPR sensor with the same structural parameters are compared with those of the dual PCFs sensor and the latter has distinct advantages concerning the spectral sensitivity,resolution,amplitude sensitivity,and figure of merits.A highly sensitive photonic crystal fibre based on surface plasmon resonance sensor operating in the near-infrared wavelength is described and analyzed.The losses of the sensor are analyzed by finite element method with the boundary condition of a perfectly matched layer.The influence of the structural parameters on the performance of the sensor is investigated based on the loss spectra of the fundamental mode.The relationship between the resonance wavelengths and analyte refractive indexes is established for refractive indexes ranging from 1.395 to 1.425 and operating wavelength ranging from 800 nm to 1300 nm.An average spectral sensitivity of 12592.86 nm/RIU can be achieved in the sensing range corresponding to a resolution of 7.94×10-6 RIU.The maximum spectral sensitivity and the maximum figure of merit are as high as 22807.14 nm/RIU and 595.78,respectively.An asymmetrical birefringence photonic crystal fiber based on a surface plasmon resonance sensor designed to detect low analyte refractive indexes is investigated by a novel birefringence analysis method.The results show that the birefringent analysis method can replace the conventional confinement loss method pertaining to the investigation SPR on asymmetrical structures.The air holes in the sensor are arranged in a square lattice structure and two active plasmonic gold layers are deposited on the inner surface of the left and right channels to enhance the SPR phenomenon.The birefringence sensor shows a broad refractive index detection range from 1 to 1.43 with the maximum wavelength sensitivity of 6300nm/RIU.
Keywords/Search Tags:photonic crystal fiber, surface plasmon resonance, refractive index detection, sensor design
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