Metamaterial Patterns of Waves (IMAGE) Duke University Caption Examples of radio waves being 'stamped' by a metamaterial-coded aperture, which allows researchers to take measurements with less data and to identify the frequency of the radio waves. Credit Aaron Diebold, Duke University 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.