1. Department of Physics, The City College of New York, 85 St. Nicholas Terrace, New York, New York 10031, United States
2. The PhD Program in Physics, Graduate Center of the City University of New York, 365 5th Avenue, New York, New York 10016, United States
3. Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
4. Nano-Science Center and Department of Chemistry, University of Copenhagen, Copenhagen 2100, Denmark
5. Photonics Initiative, Advanced Science Research Center, City University of New York, New York, 85 St. Nicholas Terrace, New York, New York 10031, United States