1. Nanophotonics Research Centre; Shenzhen University & Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University; Shenzhen 518060 China
2. ARC Centre of Excellence CUDOS and School of Engineering; RMIT University; Melbourne VIC 3001 Australia
3. School of Applied and Engineering Physics; Cornell University; Ithaca NY 14853 USA
4. Nonlinear Physics Centre, Research School of Physics and Engineering; Australian National University; Canberra ACT 2601 Australia
5. School of Physics; University of Melbourne; VIC 3052 Australia