An infrared reflectarray metasurface with engineered birefringent behavior is demonstrated. The array reradiates incoming light into two orthogonal, linearly polarized reflections. The reflectarray is composed of rectangular metallic patch nanoantennas placed on top of a grounded dielectric stand-off layer. The patches are designed to locally manipulate the phase front of the incoming wave. They tailor the reflection phase to transform the phase front on the surface to the one desired for both orthogonal polarizations at the same time. The proposed nanoantenna metasurface can find applications in many optical devices, such as birefringent modulators, waveplates, polarizers, and splitters.

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A plasmonic frequency diplexer in a metal-insulatormetal waveguide at mid-infrared range is presented. The diplexer consists of two bandpass filters connected to a power splitter. A circuit-based model is used to successfully design the configuration. The effect of metal loss is carefully considered in our simulations. The performance of the designed diplexer is outstanding in terms of the frequency selectivity and loss. The proposed scheme is scalable in the infrared range and can also be used to realize frequency multiplexers.Index Terms-Frequency diplexer, metal-insulator-metal waveguide, optical communication, plasmonic components, wavelength division multiplexing.