1. Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550
2. Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810
3. Division of Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810
4. Department of Electrical and Electronic Engineering, Muroran Institute of Technology, Muroran, Hokkaido 050-8585