1. Department of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, Virginia 23529, USA
2. Applied Research Center, Thomas Jefferson Lab, Newport News, Virginia 23606, USA
3. Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces - (IFG), D-76344 Eggenstein-Leopoldshafen, Germany
4. Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, Virginia 23529, USA