Achromatic Metalens Operates Over a Continuous Bandwidth in the Visible

The development of a flat lens that works within a continual bandwidth of colors that are close to that of an LED could lead to novel applications in imaging, spectroscopy and sensing. The development is based on the 2016 discovery of a planar metalens that can focus light with high efficiency within the visible spectrum, by using an ultra thin array of nanopillars to bend and focus light as it passes through. However, this lens can only focus one color at a time.

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