1. Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
2. Space Vehicles Directorate, Air Force Research Laboratory, Kirtland AFB, New Mexico 87117, USA
3. Department of Electrical, Electronic, and Computer Engineering, The University of Western Australia, Crawley, Washington 6009, Australia
4. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
5. Center for High Technology Materials, University of New Mexico, Albuquerque, New Mexico 87106, USA
6. Department of Electrical and Computer Engineering, The Ohio State University, Columbus, Ohio 43120, USA