1. Light, Nanomaterials & Nanotechnologies Laboratory (L2n), Université de Technologie de Troyes & CNRS EMR7004, 12 rue Marie Curie, 10004 Troyes Cedex, France
2. CNR Nanotec−Institute of Nanotechnology, S.S. Cosenza, Cubo 31C, Rende, CS 87036, Italy
3. Department of Physics, University of Calabria, Cubo 33B, Rende, CS 87036, Italy
4. Shanghai University (SHU), Sino-European School of Shanghai University, Shanghai 2000072, China
5. Key Lab of Advanced Display and System Application, Ministry of Education, School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200072, PR China