Unlike traditional curved glass lenses, the new ultra-thin metalens has no curvature whatsoever.
before, though none as large as this new version which was built using a novel technique. The new model is eight centimeters in diameter, or about four inches wide, meaning it is large enough for a telescope.
Metalenses are typically made using electron beam lithography, where a focused beam of electrons is scanned onto a piece of glass to create antenna-like patterns. However, the scanning process is time-consuming and has low throughput, limiting the resulting lens's size. "DUV photolithography is a high-throughput and high-yield process that can produce many computer chips within seconds," Ni said. "We found this to be a good fabrication method for metalenses because it allows for much larger pattern sizes while still maintaining small details, which allows the lens to work effectively."The researchers behind the new metalens adapted the DUV method with their own novel technique, rotating wafer, and stitching.
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