Grating (IMAGE) Harvard University Caption The deep "pink" grooves form an effective grating that coherently scatters the energy of the surface waves into the far-field. Credit Courtesy of the laboratory of Federico Capasso, Harvard School of Engineering and Applied Sciences Usage Restrictions None License Licensed content 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.