1. Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
2. Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
3. Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany
4. Center for High Technology Materials (CHTM), University of New Mexico, Albuquerque, New Mexico United States
5. Center for Integrated Nanotechnologies, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States