Measurement Schematic (image) Harvard University Caption A schematic of the experimental setup is shown. Ham and Yoon measured the change in phase of a microwave signal sent through the graphene. Credit Image courtesy of Hosang Yoon, Harvard SEAS. Usage Restrictions Editorial use only. 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.