1. Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan
2. Digital Innovation Center, Furukawa Electric Co., Ltd., 4-3 Okano 2, Nishi-ku, Yokohama 220-0073, Japan
3. Department of Materials Science and Engineering, Kyoto University, Kyoto 505-8501, Japan