This New Lens Converts Invisible Infrared Light into Visible Color

When a beam of infrared light strikes their ultra-thin lens—barely thicker than a red blood cell—it emerges on the other side transformed. The lens shrinks the wavelength in half, shifting invisible …

Full story: https://www.zmescience.com/science/nanotechnology-science/this-new-lens-converts-invisible-infrared-light-into-visible-color/