1. Department of Physics, Faculty of Science and Engineering, Ritsumeikan
University,
1-1-1 Noji-higashi Kusatsu-shi, Shiga 525-8577
2. Department of Photonics, Faculty of Science and Engineering,
Ritsumeikan University,
1-1-1 Noji-higashi Kusatsu-shi, Shiga 525-8577