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(a) Schematic of the geometry under consideration. Light is shined from the normal direction with electric field Ez and an admittance surface Yz(x) over a thin substrate and a ground plane. (b) Sketch of the relation between incident power Pinc and deflected power Pout. When the metasurface is lossless, power is conserved in the system. (c) Geometry of interest to maximize deflection, assuming a lossless superstrate, i.e., ignoring the imaginary part of permittivity for the absorbing material. Scattered electric field profile for one-way and two-way deflection. For two-way deflection, the reflection phase is π/2 for both beams. Frequency and deflection angle are set to 300 THz and 60°,respectively (d) Admittance profile for one-way and two-way deflection, used in panel (c), and calculated reflection efficiency for both cases.
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