Illustration of Tunneling Junction (IMAGE) University of California - San Diego Caption Illustration of nanosized device made of two joined silver single crystals that generate light by inelastical electron tunneling. Credit Steven Bopp Usage Restrictions Please credit: Steven Bopp 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.