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Novel Subwavelength Microwave Waveguides Based On Spoof Surface Plasmon Resonance

Posted on:2016-05-14Degree:MasterType:Thesis
Country:ChinaCandidate:F F QinFull Text:PDF
GTID:2348330503986984Subject:Physical Electronics
Abstract/Summary:PDF Full Text Request
With the development of information technology, people pay close attention to the high integration of photon and microwave devices, which surface plasmon becomes a hotter research. SP is electromagnetic resonance state propagating along the interface between metal and dielectric, and its operating frequency is generally in the visible and near-infrared region. Interesting, artificial surface plasmon (spoof SP) can broaden the operating frequency. The paper mainly studies how to adjust the geometric parameters of artificial structures to realize the SPs transmission control in the microwave and terahertz region.In this thesis, we start from the two characteristic of the surface plasmon to understand the SPs propagation mode in the inner surface of metal waveguide. Surface plasmon can generally be divided into localized surface plasmon (LSP) and surface plasmon polariton (SPP). Firstly, we introduce some structure that supporting spoof SPP and summarize the respective advantages and disadvantages. Then we analyze the basic characteristics of a one-dimensional finite thick metal structure, which drilled an array of holes in the surface, in detailed. Also we use finite element method to verify the relationship between the transmission characteristics of the spoof SPP and geometric parameters of the structure. In addition, we carry out direct measurement of microwave experiments to measure dispersion curves of the first-order mode and the second-order mode, which is in agreement with the calculation.We also study a 2D groove metal array structure, which can support additional higher order surface bound modes. This calculation is in agreement with the theory results.Furthermore, we study the characteristic of a cylindrical structure rolled by finite one-dimensional periodic grooves metal surface, namely the spoof LSP characteristic. Beginning with the theoretical study of the relationship between the resonance peak position and geometric parameters, we carry out simulation analysis of the resonance situation of two-dimensional structure and three-dimensional structure, respectively. On this basis, we propose a new composite structure and discuss its coupling mode, especially the Fano resonance caused by mode competition in this composite structure.When extended to practical applications, in order to bind up the spoof SPP tightly in a smaller size range, we introduce a novel waveguide-"spoof-insulator-spoof'(SIS) waveguide. Compared from the theory and numerical simulation, we introduce the relationship between the dispersion curve of this structure and the geometrical parameter.Finally, we study the asymmetrical multimode coupling phenomenon between the spoof LSP resonator and the SIS waveguide system. Model components are spoof LSP resonator and two SIS waveguide. Starting from the Hamiltonian, we develop a new multi-mode coupled theory which can fully account the dynamics of the multiple resonant modes and their couplings to external waveguide (including waveguides and radiation channels). Through proper selecting the order of the resonant modes, we give the theoretical predictions that agree with the numerical results.
Keywords/Search Tags:sub-wavelength waveguide, surface plasmon, finite element method, dispersion curve, multi-mode coupled mode theory
PDF Full Text Request
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