| Summary: | 碩士 === 國立臺灣師範大學 === 光電科技研究所 === 102 === In this thesis, the filtering properties in one-dimensional photonic crystals (1D PCs) containing SNG materials are investigated. We consider two filtering structures of (1/2)nA(2/1)n and (1/2)nB(2/1)n, in which both layers 1 and 2 are dielectrics, n is the stack number, and the defect layers A and B are taken to be ENG and MNG materials, respectively. Two main topics are involved.
The first part is to investigate the effect of SNG material on the defect mode in a 1D defective PC. It is found that the channel frequency can be tuned by the variation of permittivity, permeability and thickness of the defect layer. We also investigate the influence of incident angle for both transverse electric (TE) wave and transverse magnetic (TM) wave.
The second part is to design and analysis of tunable double-channel filter based on the use of an SNG defect. The embedded SNG material plays a role of tuning factor for the double-channel filter. The tunable characteristics are studied by changing the static positive parameter, plasma frequency, angle of incidence and the thickness of the defect layer. The proposed filter could be of technical use in signal processing and communication applications.
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