1 Centre for Micro-Photonics, Faculty of Science, Engineering and Technology, Swinburne University of Technology,Hawthorn, VIC 3122, Australia
2 Department of Mechanical Engineering, Eindhoven University of Technology,Postbus 513, 5600MB Eindhoven, The Netherlands
3 Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, UK
4 Melbourne Centre for Nanofabrication, 151 Wellington Road, Clayton, VIC 3168, Australia
5 Ecole Polytechnique Fédérale de Lausanne, Rue de la Maladiére 71b, CH—2002 Neuchatel, Switzerland
6 Center for Nanotechnology, King Abdulaziz University, Jeddah 21589, Saudi Arabia