1. Texas A&M University, Department of Physics and Astronomy, 4242 TAMU, College Station, TX 77843, USA
2. Texas A&M University, Department of Biomedical Engineering, 3120 TAMU, College Station, TX 77843, USA
3. Tarleton State University, Department of Chemistry, Geosciences, and Physics, 1333 W. Washington Stephenville, TX 76402, USA
4. Texas A&M University, Department of Electrical Engineering, 3127 TAMU, College Station, TX 77843, USA