1. Department of Physics and Optical Science; Center for Optoelectronics and Optical Communications, University of North Carolina at Charlotte; Charlotte NC 28223-0001 USA
2. Air Force Research Laboratory; Sensors Directorate, Wright-Patterson AFB; OH 45433 USA
3. Air Force Research Laboratory; Materials and Manufacturing Directorate, Wright Patterson AFB; OH 45433 USA
4. Lincoln Laboratory; Massachusetts Institute of Technology; Lexington Massachusetts 02420 USA