Nonlinear Graphene Quantum Capacitors for Electro-optics (IMAGE) Ecole Polytechnique Fédérale de Lausanne Caption This is an insulating boron nitride sandwiched between two graphene sheets. Credit ©EPFL/ LPQM 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.