1. College of Optics and Photonics/CREOL, 4000 Central Florida Blvd, University of Central Florida, Orlando, Fl, 32816, USA
2. Institut National de la Recherché Scientifique, Université du Québec, Varennes, Québec, Canada J3X 1S2, Canada
3. Physics Department of Physics, University of Arkansas, Fayetteville, Ark, 72701, USA
4. Centre de Recherche en Nanofabrication et en Nanocaractérisation, CRN2, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K2R1, Canada
5. Department of Electrical and Electronic Engineering, University of Glasgow, Glasgow, Scotland, G12 8QQ, United Kingdom
6. University of Paderborn, 33095 Paderborn, Germany
7. Department of Physics and Astronomy, San Francisco State University, CA 94132, USA
8. TEDA Applied Physics School, Nankai University, Tianjin 300457, China