Advanced light control: A laser beam hits a meta-grating that directs the light waves even at steep incidence angles, thus enabling new optical applications. Credit: Maryna Leonidivna Meretska Conventional curved lenses, which direct light by refraction in glass or plastic, are often bulky and heavy, offering only limited control of light waves. Metasurfaces, in contrast, are flat and consist of an array of tiny structures known as meta-atoms. Meta-atoms influence light at a subwavelength scale ...