1. Graduate School of Engineering, University of Fukui, Fukui 910-8507, Japan
2. Faculty of Advanced Science and Technology (FAST), Kumamoto University, Kumamoto 860-8555, Japan
3. Institute of Electrical Engineering, Slovak Academy of Sciences, 84104 Bratislava, Slovakia
4. Research Center for Integrated Quantum Electronics (RCIQE), Hokkaido University, Sapporo 060-0813, Japan
5. Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University, Nagoya 464-8601, Japan