SEM of Plasmon Sensor (IMAGE) University of California - Berkeley Caption The scanning electron microscope shows the semiconductor (made of cadmium sulfide) on top of the metal surface (silver). Credit Ren-Min Ma and Sadao Ota Usage Restrictions All rights reserved. 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.