Tunable Multichannel Plasmonic Filter Based on Coupling-Induced Mode Splitting

Plasmonics - Tập 10 - Trang 139-144 - 2014
Zhao Zhang1, Fenghua Shi1, Yihang Chen1
1Laboratory of Quantum Information Technology, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou, China

Tóm tắt

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.

Tài liệu tham khảo

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