1. Sandia National Laboratories, Albuquerque, New Mexico, United States
2. Department of Information Engineering, University of Padova, Padua, Italy
3. Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, Texas, United States
4. Department of Information Engineering, University of Brescia, Brescia, Italy
5. Charles M. Bowden Research Lab, U.S. Army AMRDEC, Huntsville, Alabama, United States
6. Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico, United States