Therefore, these RFMs can reflect light like rough optical surfaces yet transmit light like smooth surfaces in a broad bandwidth. The random configurations only lead to the global random phase in reflection, which bestows diffuse reflection. The reciprocity principle ( 4– 7) and space inversion guarantee that these RFMs have distortion-free transmission despite the randomness. These RFMs are composed of random distributions of two types of metasurface blocks related by the space inversion (“flip”) operation. Here, we demonstrate a type of random-flip metasurfaces (RFMs) that may resolve this long-existing problem. The antiglare coatings ( 3) using textured surfaces or suspended particles can reduce the glare but always at a substantial trade-off in the resolution and clarity of the transmitted scene. The consequences of this dilemma are the glare and reflective images that generally appear on the glass and the screens of the display devices, which often cover the transmitted images and even hurt the eyes. Therefore, diffuse reflection and distortion-free transmission are usually incompatible. This feature, which originates from breaking the phase correlation between reflection and transmission by the metasurface, could enable a range of new optical materials and display technology.Ī rough surface causes diffuse reflection ( 1) and blurred transmission by destructing spatial phase coherence in contrast, a flat surface allows specular reflection ( 2) and distortion-free transmission with uniform distribution of phase difference. On the basis of complementary random arrays of gold nanorods, we verified this functionality by both optical spectroscopy and imaging experiments over a broad range of frequencies from the visible to the infrared regime. Notably, the metasurface reflects like a rough surface yet transmits like a smooth one in a broad spectrum. These metasurfaces have a globally random phase in reflection that leads to diffuse reflection, while the local space inversion and reciprocity principle ensure distortion-free transmission. Here, we merge the traditionally incompatible diffuse reflection and undistorted transmission by introducing the concept of random-flip metasurfaces made of randomly flipped components. Rough surfaces lead to diffused light in both reflection and transmission, thereby blurring the reflected and transmitted images.
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