Abstract
Multimode interference (MMI) effect in metal-insulator-metal (MIM) waveguides is studied in this paper. Theoretical calculation based on the self-imaging principle and the finite element method (FEM) simulation are used to analyze the effect and further guide the design of plasmonic MMI devices. We show that wavelength-selective routing and splitting with high extinction ratios can be realized in the multimode waveguides, and active control by refractive index modulation is also demonstrated.
Highlights
Surface plasmon is regarded as a promising candidate for realizing chip-scale photonic integration and optical-electrical interconnection
For the MIM waveguides, researches are generally focused on single mode waveguides which have the ability to guide and modulate light in a subwavelength scale, whereas very little attention has been paid on designing the plasmonic multimode interference (MMI) devices
Design of plasmonic MMI devices in MIM waveguides 3.1 Demultiplexer based on 1 × 2 configuration we propose a wavelength demultiplexer using the MMI effect
Summary
Surface plasmon is regarded as a promising candidate for realizing chip-scale photonic integration and optical-electrical interconnection. To achieve this goal, several kinds of plasmonic waveguide-based structures, such as long range surface plasmon waveguides, dielectric-loaded waveguides, metallic nanowires and metal-insulator-metal (MIM) waveguides, have been proposed in the recent years [1,2,3,4,5,6,7], Among these, MIM waveguide. Recent advances in multimode dielectric waveguides show a great application value of multimode interference (MMI) effects in conventional integrated optics [8,9]. Since the wavelength division multiplexing system (WDM) requires various functional devices, it is important to explore the MMI effect and its application in different kinds of plasmonic waveguides. With the help of the self-imaging principle, the interference property is analyzed, followed by a discussion of the plasmonic MMI devices, including demultiplexer, wavelength-selective splitter and active tunable splitter
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