1. College of Science and Technology, Nihon University, Tokyo 101-8308, Japan
2. Department of Physics, Engineering Physics and Astronomy, Queen’s University, Kingston, Ontario K7L 3N6, Canada
3. Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
4. Graduate School of Science and Technology, Gunma University, Kiryu, Japan
5. TAE Technologies, Inc., Foothill Ranch, California 92610, USA