1. Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, USA
2. Department of Civil and Environmental Engineering, The George Washington University, Washington, DC 20052, USA
3. Air Force Research Laboratory, Wright Patterson Air Force Base, Dayton, Ohio 45433, USA
4. Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, United Kingdom
5. Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA
6. Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA
7. Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA
8. Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, USA