Design of All-Optical Directional Coupler Using Plasmonic MIM Waveguide for Switching Applications

In this paper, we have proposed, analyzed, and verified the performance of an optimized plasmonic 10-dB directional coupler a 3-dB in 2-D waveguides using finite-difference-time-domain (FDTD) method. A are based on metal–insulator-metal (MIM) slab waveguide analyzed at telecommunication wavelength (?) 1550 nm. Here, coupling transmission characteristics with separation distance between two parallel waveguides. The developed approach ensures minimization crosstalk overall length via simultaneous adjustment linear waveguide. Then, structure is acquired by trading off distance. proposed feature good energy confinement, ultra-compact, low propagation loss, which has potential applications photonic integrated devices, optical signal processors, other all-optical switching devices.