Arbitrary beam control using passive lossless metasurfaces enabled by orthogonally-polarized custom surface waves

Abstract

For passive, lossless impenetrable metasurfaces, a design technique for arbitrary beam control of receiving, guiding, and launching is presented. Arbitrary control is enabled by a custom surface wave in an orthogonal polarization such that its addition to the incident (input) and the desired scattered (output) fields is supported by a reactive surface impedance everywhere on the reflecting surface. Such a custom surface wave (SW) takes the form of an evanescent wave propagating along the surface with a spatially varying envelope. A growing SW appears when an illuminating beam is received. The SW amplitude stays constant when power is guided along the surface. The amplitude diminishes as a propagating wave (PW) is launched from the surface as a leaky wave. The resulting reactive tensor impedance profile may be realized as an array of anisotropic metallic resonators printed on a grounded dielectric substrate. Illustrative design examples of a Gaussian beam translator-reflector, a probe-fed beam launcher, and a near-field focusing lens are provided.

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• Omega-bianisotropic metasurface for converting a propagating wave into a surface wave
• Lossless, Complex-Valued Optical Field Control with Compound Metaoptics
• Experimental Demonstration of A Dual-Input/Dual-Output Reflective Impedance Metasurface
• Arbitrary Wave Transformations with Huygens' Metasurfaces through Surface-Wave Optimization