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[1
]Division of Physics and Applied Physics School of Physical and Mathematical Sciences
Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
[2
]Center for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological
University Singapore 639798 Singapore
[3
]Natural Sciences and Science Education National Institute of Education Nanyang Technological
University Singapore 637616 Singapore
[4
]Department of Electronic Devices and Engineering Graduate School of Science and Engineering
Yamaguchi University Ube 755–8611 Japan
[5
]Department of Physics and Information Technology Faculty of Computer Science and System
Engineering Kyushu Institute of Technology Iizuka 820–8502 Japan