1. Department of Electrical
and Computer Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
2. Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
3. Centre for Micro-Photonics, Faculty of
Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
4. Melbourne Centre for Nanofabrication (MCN), Australian National Fabrication Facility, Clayton, VIC 3168, Australia
5. Research
Institute for Electronic Science, Hokkaido University, North 21
West 10, Kita-ku, Sapporo, Hokkaido, Japan