Improved Acoustic Imaging (IMAGE) University of California - Berkeley Caption A typical sonagraphic image of the letter E etched into a copper plate reveals no detail (center). When evanescent waves from the object are captured and transmitted by the new 3-D holey-structured metamaterial, sufficient detail can be obtained to identify the letter. Credit Jie Zhu/UC Berkeley, Johan Christensen/Universidad Autonoma de Madrid. 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.