Abstract
In this work, we design and study a dielectric phase-gradient metagrating (DPGM) with SiGe whose operating frequency is in the visible band. It is found that this DPGM can enable negative refraction for incident light over a wide incident angle, and due to the tolerances in the metasurface design, this negative refraction has a broadband response from 400 nm to 470 nm. The underlying mechanism is due to the m-dependent diffraction law. An angularly asymmetric transmission phenomenon is observed in the designed DPGM, and the physical mechanism behind the phenomenon is revealed. Our results pave the way to achieving negative refraction in visible frequencies.
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