Schematic Diagram of a Terahertz Quantum Cascade Laser Patterned with a Metamaterial Collimator (image) Harvard University Share Print E-Mail Caption 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 Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.