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Abstract
This paper presents the design and analysis of planar plasmonic wavelength demultiplexer for optical communication systems. The demultiplexer is based on silver-air-silver plasmonic waveguide supported by two nanocavities for each drop channel. One cavity is used as a resonant tunneling-based channel drop filter while the other is used to realize wavelength-selective reflection feedback in the bus waveguide.  For each channel, a parametric study is performed to characterize the performance of the two corresponding nanocavities when they are operating in isolated mode.  The results are then used as a basis to design a single-channel demultiplexer by introducing the coupling between the two nanocavities. Simulation results are reported for a three-channel demultiplexer (1550, 1300, and 850 nm) using Computer Simulation Technology (CST) software package. A drop efficiency as high as  is obtained for each drop channel in the designed demultiplexer. The simulated results can be used as a guideline to design ultra-compact wavelength-division multiplexing (WDM) systems in highly integrated optical circuits.Â
Highlights
The capability of plasmonic structures to confine photons in the subwavelength regime has brought new concepts into the nanophotonic technology
surface plasmon polaritons (SPPs) are electromagnetic (EM) waves propagating along the metal dielectric interface with an exponentially decaying field in both sides
Lu et al [9] has proposed and numerically investigated a novel kind of planar nanoscale plasmonic wavelength demultiplexing structure based on channel drop filters in MIM waveguide with reflection nanocavities
Summary
The capability of plasmonic structures to confine photons in the subwavelength regime has brought new concepts into the nanophotonic technology. Lu et al [9] has proposed and numerically investigated a novel kind of planar nanoscale plasmonic wavelength demultiplexing structure based on channel drop filters in MIM waveguide with reflection nanocavities. The concepts of this structure were already reported by Ren et al [11] using photonic crystal platform. The design methodology for each drop channel is based on investigation the characteristics of each one of the corresponding two nanocavities embedded in the structure separately before combining them to form the demultiplexer. The investigated structure could find important applications in highly integrated optical circuits in the future
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