1. Department of Physics, Michigan Technological University, Houghton, Michigan 49931, United States
2. Department of Physics, H. P. T. Arts and R. Y. K. Science College, Nasik, Maharashtra, India
3. National Physical Laboratory (NPL), Delhi, India
4. U.S. Air Force Research Laboratory, Dayton, Ohio 45433, United States
5. U.S. Army Research Laboratory, Weapons and Materials Research Directorate, ATTN: AMSRD-ARL-WM, Aberdeen Proving Ground, Maryland 20783, United States