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Comparison of steering range of a single SLM structure and a metasurface-coupled SLM structure. (a) Without the metasurface, the SLM can provide only a small diffraction envelope that is determined by pixel size, and thus can steer light only within a limited angular range. (b) With the metasurface-coupled SLM structure, since each scatterer is subwavelength, the steereable range can span from −90° to 90°.
