'Lossless' Metamaterial (IMAGE) University of California - San Diego Caption SEM images of a 'lossless' metamaterial that behaves simultaneously as a metal and a semiconductor. Credit Ultrafast and Nanoscale Optics Group at UC San Diego Usage Restrictions Please credit: Ultrafast and Nanoscale Optics Group at UC San Diego 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.