1. Department of Mechanical Engineering, Brigham Young University, 435 Crabtree, Provo, Utah 84602, United States
2. Department of Mechanical Engineering, Iowa State University, 2104 Black Engineering, Ames, Iowa 50011, United States
3. U.S. Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, D.C. 20375, United States
4. Department of Physics and Astronomy, Brigham Young University, N283 Eyring Science Center, Provo, Utah 84602, United States