Author Affiliations

E. D. Kinigstein,^1,* S. -W. Huang,¹ M. Y. Sfeir,² W.-K. Koh,³ C.B. Murray,⁴ T.F. Heinz,⁵ and C. -W. Wong^1,**

¹Optical Nanostructures Laboratory, Center for Integrated Science and Engineering, Solid-State Science and Engineering, and Mechanical Engineering, Columbia University, New York, NY, 10027 USA.

²Center for Functional Nanomaterials, Brookhaven National Laboratory, P.O. 5000, Bldg. 735, Upton, NY, 11973-5000.

³Los Alamos National Laboratory, Physical Chemistry and Applied Spectroscopy Division, Los Alamos, New Mexico, USA

⁴Department of Chemistry, University of Pensilvania, Philadelphia, PA, 19104

⁵Department of Physics, Columbia University, New York, NY, 10027

^*Corresponding author: ek2539@columbia.edu

^** cww2104@columbia.edu