1. Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
2. Fraunhofer USA Center for Coatings and Diamond Technologies, East Lansing, Michigan 48823, USA
3. Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
4. Department of Electrical and Computer Engineering, Michigan State University, East Lansing, Michigan 48824, USA
5. Department of Materials Design and Innovation, University at Buffalo, The State University of New York, Buffalo, New York 14260, USA
6. Korea Photonics Technology Institute, Wolchul-dong, Buk-gu, Gwangju 61007, South Korea
7. Department of Physics, Yeungnam University, Daehak-ro 280, Gyeongsan, Gyeongbuk 38541, South Korea