Institution: | 1. Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark2. Center for Nanostructured Graphene, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark3. Department of Micro and Nanotechnology, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark |