Ultrathin wafer of silicon and gold focuses telecom
wavelengths without distortion
Applied physicists at the Harvard School of Engineering and
Applied Sciences (SEAS) have created an ultrathin, flat lens that focuses light
without imparting the distortions of conventional lenses.
At a mere 60 nanometers thick, the flat lens is essentially
two-dimensional, yet its focusing power approaches the ultimate physical limit
set by the laws of diffraction.