Design of low-cross-talk metal-insulator-metal plasmonic waveguide intersections based on proposed cross-shaped resonators

Cross-shaped resonator topologies for realization of metal-insulator-metal (MIM) plasmonic filters are introduced and comprehensively studied. The structures are numerically simulated using finite difference time domain method. It is shown that single-mode MIM filters can be obtained using the proposed topologies for the wavelength range of 400 nm to 2 mu m. Analytical formulas for designing the filters have also been proposed. As an important application, the cross-shaped resonators can be used for design of low-cross-talk waveguide intersections. The simplicity of the design, the ability to use analytical formulas, and obtaining a single-mode resonance are the benefits of the proposed cross-shaped topologies. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)