1. Theoretical
Division, Center for Nonlinear Studies and Center for Integrated Nanotechnologies
(CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
2. Department
of Electrical and Computer Engineering, and Photonics Center, Boston University, Boston, Massachusetts 02215, United States
3. Universidad Nacional de Quilmes, Roque Saenz Pea 352, B1876BXD Bernal, Argentina
4. Department
of Chemistry and Biochemistry and Materials Science Institute 1253, University of Oregon, Eugene, Oregon 97403, United States