1. Department of Computational Mathematics, Science and Engineering, Michigan State University, East Lansing, Michigan 48824, USA
2. Department of Electrical and Computer Engineering, Michigan State University, East Lansing, Michigan 48824, USA
3. Fraunhofer Center for Coatings and Diamond Technologies, Michigan State University, East Lansing, Michigan 48824, USA
4. Department of Chemical Engineering and Material Science, Michigan State University, East Lansing, Michigan 48824, USA
5. Department of Electrical Engineering, Tsinghua University, Beijing 10084, China