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Electromagnetic remotely controlled metasurface concept. The metasurface is represented as an array of Jerusalem crosses. In this example, zero reflection is specified. (a) An incident wave (or signal) is transformed into a transmitted wave refracted at 45°. (b) When a control wave (in red) is impinging on the metasurface, the transmitted wave refraction angle becomes −45°. Note that both signal and control waves have the same frequency.
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