1. Applied Physics, Faculty of Engineering, Osaka Institute of Technology, Osaka 535-8585, Japan
2. Nanomaterials Microdevices Research Center, Osaka Institute of Technology, Osaka 535-8585, Japan
3. Department of Biomedical Engineering, Graduate School of Engineering, Osaka Institute of Technology, Osaka 535-8585, Japan
4. Osaka Municipal Technical Research Institute, Osaka 536-8553, Japan
5. Tomoe Works Co., Ltd., Osaka 552-0001, Japan