Room Temperature Plasmon Laser (IMAGE) University of California - Berkeley Caption UC Berkeley researchers have developed a plasmon laser that can generate sub-diffraction light at room temperature. On the left is a schematic showing a cadmium sulfide (CdS) square atop a silver (Ag) substrate separated by a 5 nanometer gap of magnesium fluoride (MgF2). The cadmium sulfide square measures 45 nanometers thick and 1 micrometer long. The most intense electric fields of the device reside in the magnesium fluorid gap. On the right is a scanning electron microscope image of the plasmon laser. Credit Renmin Ma and Rupert Oulton, UC Berkeley Usage Restrictions All rights reserved. Include credit/source with use of image. 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.