1. Laser Technology Laboratory, RIKEN, 2-1 Hirosawa, Wako-city, Saitama 351-0198
2. Department of Electronics and Electrical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522
3. Laboratory for Cell Function Dynamics, Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako-city, Saitama 351-0198