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World-first switchable metalens developed to toggle between 2D and 3D

A South Korean research team has developed what it called the world’s first display technology that can switch freely between 2D and 3D without glasses by attaching a metalens to a smartphone screen. The Ministry of Science and ICT said the technology uses a 1.2 mm-thin metalens that changes light refraction with applied voltage, showing 2D without distortion and 3D with a 100-degree viewing angle. The work was published in Nature on April 23.