Physorg.com -- The metamaterial patterns are directly sculpted on the highly doped GaAs facet of the device. Artificial coloring in the figure indicates deep and shallow micron scale grooves, which have different functions. The shallow “blue” grooves efficiently couple laser output into surface electromagnetic waves on the facet and confine the waves to the facet. Credit: Courtesy of the laboratory of Federico Capasso, Harvard School of Engineering and Applied Sciences.
