| Summary: | 碩士 === 國立勤益科技大學 === 電子工程系 === 107 === In this study, the finite element method (FEM) and the eigenmode expansion method (EEM) was employed to discuss and analyze discrete phase-shift fiber Bragg grating (DPS-FBG), tilted fiber Bragg grating (TFBG), and novel localized surface plasmon resonance optical biochemical fiber sensors. When designing optical fiber components, the traditional coupled-mode theories are typically applied as the theoretical basis for optical fiber components based analysis. However, for individuals who are new to using optical fiber or designers who use optical fiber purely for its design functions, the coupled-mode theories are too complex to master and use immediately. Therefore, this paper proposed a simple and rigorous design procedure with the graphical simulation results, indirectly reduces the theoretical basis for who are new to using optical fiber or designers who use optical fiber purely for its design functions. If design the structure of an optical component is periodical, compared with the finite-difference time-domain (FDTD), by integrating FEM and EEM not only the time required for computation but also the amount of server memory can be substantially reduced. When performing numerical simulations, in order to effectively reduce the resource of the simulation server, both finite element method and the eigenmode expansion method were performed in combination with a perfectly matched layer (PML), a perfectly reflecting boundary (PRB), an object meshing method (OMM), and a boundary meshing method (BMM). The integrated method enables designers to easily and flexibly design optical fiber communication systems that conform to the specific spectral characteristic by using the simulation data in this paper. Compared with the general biochemical sensor, this paper presents a novel geometrical structure of NPs on optical fiber for high-sensitivity biochemical sensors. In order to effectively improve the sensitivity of the sensor, this paper used an innovative arrangement method of a metallic nanoparticle array. Through this innovative arrangement and combination, the resonance area of the surface plasma is effectively increased. Results of the simulations indicated that the proposed sensor was short in physical length (approximately 320μm), high in resolution (approximately −140 dB), and high in sensitivity (135221.334 nm/RIU).
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