Tunable Multichannel Plasmonic Filter Based on Coupling-Induced Mode Splitting

Combining with tight-binding approach, novel multichannel plasmonic filters are designed by inserting identical coupled cavities between metal-insulator-metal waveguides. We show that the eigenmodes of the plasmonic cavities will asymmetrically split under their coupling with each other. Such an asymmetrical mode splitting provides strongly correlated transmission channels which can be manipulated simultaneously. All channels will red shift or blue shift with the changing of the lengths or widths of the rectangular cavities. The intervals of the channels can be tuned by adjusting the coupling strength of the cavities. Both finite difference time domain method and transfer matrix method are used to investigate the considered plasmonic system. Our results may have important applications in the fields of high-density plasmonic integration circuits and nonlinear plasmonic devices.

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