Abstract
We propose a plasmonic filter with a notch located along a rectangular resonator. The finite difference time domain method is utilized to investigate and analyze the transmission characteristics of the filter. Results reveal that the introduction of the notch affects the first and second resonant modes of the resonator in different manners due to different magnetic field distributions inside the resonator. The evolution of the transmission-peak wavelengths as a function of the notch position with the same total resonator length is given. Effects of geometrical parameters of the notch on peak wavelengths are also studied. The corresponding theoretical model of our proposal is discussed, which agrees well with simulation results.
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