1. Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
2. Photon Craft Project, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences and Japan Science and Technology Agency, Keihanna-Plaza, Kyoto 619-0237, Japan
3. Optoelectronics Research Centre, University of Southampton, SO17 1BJ, United Kingdom