Interface (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Diffraction signal is generated by periodic variation of optical susceptibility at the interface, which comes from both the graphene grating itself and different adsorbed molecules in the electrolyte double layer induced by the graphene grating. Credit Feng Wang, Berkeley Lab Usage Restrictions None 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.