Abstract
We propose a translationally invariant metamirror for light filtering in reflection. The device consists of a thin transverse grating in the micron scale positioned in front of a flat mirror. We analyze the performance of such a photonic metamirror and find a modification of the angular spectrum of the reflected beams, leading to a significant reduction of the beam divergence for particular configurations. This study points toward a type of optical component, a flat metamirror with a filtering functionality and no alignment requirements, due to its translational invariance.
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