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Abstract
A compact plasmonic branch-shaped metal–insulator–metal (MIM) waveguide with a triangular-annular channel is proposed and investigated. The results show that all-band waves can transmit through the structure when it has transmission symmetry. As the symmetry is broken, a typical filtering function is obtained and the transmissivity of the resonance frequency depends on the destroyed degree of symmetry, which results from interference between the two branched surface plasmon polaritons waves (SPPs) propagating along the branch-shaped waveguide. Moreover, the filtering wavelength can be selected by changing the length of the triangular-annular channel. These asymmetric waveguide structures may open up new avenues toward the control of SPPs and the development of filters based on plasmonic designs.
Acknowledgement
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11074069 and 61176116), the Hunan Provincial Science and Technology Project of China (Grant No. 2012FJ4121), the Hunan Provincial Natural Science Foundation of China (Grant No. 12JJ4009) and the Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province.