[1] Univ Tokyo, Dept Elect Engn & Informat Syst, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan
[2] Ho Chi Minh City Univ Educ, Dept Phys, 280 An Duong Vuong St,Dist 5, Ho Chi Minh City 748242, Vietnam
[3] Tokyo Inst Technol, Dept Elect & Elect Engn, Meguro Ku, 2-12-1 Ookayama, Tokyo 1520033, Japan
[4] Univ Tokyo, CSRN, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan
[5] Univ Tokyo, Inst Engn Innovat, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan