Optical Phased Array Functions in Double-Layered Metallic Plate Systems with Artificially Modulated Slit Arrays

We investigated the optical propagation properties of systems composed of two different metallic plates with cut-through slit arrays at artificially modulated intervals. Simulation studies using the finite-difference time-domain method showed that the phases of the light waves emitted from the slits can be changed by controlling the paths of the spoof surface plasmon polaritons (SPPs) in the air gap region sandwiched between the two arrays. Furthermore, by making use of the present optical phased array functions based on SPP-assisted optical transmission phenomena, the lens like effects of both convex and concave are demonstrated.