Modeling of active plasmonic coupler and filter based on metal-dielectric-metal waveguide

摘要

Optical functions such as filtering and coupling play an important role in Nano-optics systems. This paper discusses the ability of MDM plasmonic slot waveguide to realize these functions with some help from stub resonators connected either in parallel or in series with the slot waveguide according to the needed function. These resonators are filled with an active material has a tunable absorption coefficient (K) which indicates the power level of an external control signal. The adjustable parameters of the stub resonators can control the properties of our devices. At our desired optical wavelength λ = 1550 nm; first, we introduce a unidirectional coupler satisfies an insertion loss (coupler factor) closes to 0 dB and a coupling ratio closes to 100% at the desired output channel. Second a band-reject filter satisfies a pass-band transmission close to 90% and has a forbidden band width of 75 nm located in the frequency range of (1510-1585) nm. The components would be useful in the optical interconnect networks, photonic integrated circuits, and wavelength division multiplexing.