Numerical Investigation of a Branch-Shaped Filter Based on Metal-Insulator-Metal Waveguide
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Using the finite difference time-domain method, we present a comprehensive numerical investigation of a branch-shaped filter based on the metal-insulator-metal (MIM) waveguide. The results show that several passbands and stopbands appear in the transmission spectra, which are resulted by the phase differences between the surface plasmon polaritons (SPPs) propagating along the straight waveguide and the SPPs resonating in the circuit formed by the branch and the straight waveguide. The effects of the structural parameters of the branch-shaped filters on their transmission properties are also studied. These results not only present an alternative plasmonic filter for the MIM waveguides but also help us to understand the transmission properties of the circuit-shaped structures.
KeywordsSurface plasmon polariton Waveguide Filter Finite difference time-domain method
This work was supported by National Natural Foundation of China (Grant Nos. 11004160, 10904009, and 10974157), the Natural Science Foundation of CQ CSTC (Grant Nos. CSTC2010BB4005 and CSTC2010BA6002), the Fundamental Research Funds for the Central Universities (Grant Nos. XDJK2009C078 and XDJK2009A001), and the Southwest University Research Foundation (Grant No. SWU109024).
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