1. NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
2. Department of Physics, University of Central Florida, Orlando, Florida 32816, United States
3. Department of Electrical and Computer Engineering, University of Central Florida, Orlando, Florida 32816, United States
4. Department of Applied Mathematics and Statistics, Stony Brook University, Stony Brook, New York 11794, United States
5. Analytical Research Division, Korea Basic Science Institute, Jeonju 54907, South Korea
6. Air Force Research Lab, Eglin Air Force Base, Florida 32542, United States
7. Department of Materials Science and Engineering, University of Central Florida, Orlando, Florida 32816, United States