1. Department of Physics, New Mexico State University, P.O. Box 30001, Las Cruces, New Mexico 88003, USA
2. Department of Physics, Arizona State University, Tempe, Arizona 85287, USA
3. KBRwyle, 2601 Mission Point Blvd., Suite 300, Dayton, Ohio 45431, USA
4. Air Force Research Laboratory, Sensors Directorate, Wright-Patterson Air Force Base, Ohio 45433, USA