Understanding supercurrents (IMAGE) Iowa State University Caption A maze of mirrors on the cm-SNOM instrument creates an optical pathway for for light pulsing at trillions of cycles per second. Credit Photos by Christopher Gannon/Iowa State University. Usage Restrictions None License Original 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.