Nanoplasmonic triple-wavelength demultiplexers in two-dimensional metallic waveguides
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- Lu, H., Liu, X.M., Wang, L.R. et al. Appl. Phys. B (2011) 103: 877. doi:10.1007/s00340-011-4525-0
A novel kind of plasmonic wavelength demultiplexers (WDMs) based on two-dimensional metal–insulator–metal waveguides with side coupled nanocavities (SCNCs) is proposed and numerically investigated. The WDMs contain three waveguide output channels, each of which functions as a dual-stopband plasmonic filter. The demultiplexing wavelengths can be tuned by controlling the lengths and widths of SCNCs. The finite-difference time-domain results can be accurately analyzed by the resonant theory of nanocavity. Our structures have important potential applications for design of WDM systems in highly integrated optical circuits.