Design of metal-grating-based surface plasmon interconnector between thin metal films

Metal-grating-based interconnection schemes which interconnect two or three layers of thin metal film waveguides for the surface plasmon polaritons (SPPs) are investigated. In our proposed structure, SPPs propagating along a metal film are diffracted with a specific deviation angle when they pass through metal gratings. The diffracted light waves are converted into the SPP mode by properly arranged metal gratings on each metal film. Based on the well-established finite-element method (FEM), the design of proposed interconnector structures is evaluated and the performances are analyzed numerically. The efficiency of the directional interconnection is analyzed also.