1. Department of Mechanical Engineering, Hachinohe Institute of Technology, Hachinohe 031-8501, Japan
2. Division of Applied Physics, Hokkaido University, Sapporo 060-8628, Japan
3. Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0021, Japan
4. College of Creative Studies, Niigata University, Niigata 950-2181, Japan