light generation (IMAGE) University of Vienna Caption Artistic image of the light generation using a heterostructure of graphene and metal nanostructures. This heterostructure allows for a giant enhancement of a nonlinear optical process that changes the properties of light, such as its frequency (color). Credit © Thomas Rögelsperger, University of Vienna 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.