1. CINTRA CNRS/NTU/THALES; UMI 3288; Research Techno Plaza; 50 Nanyang Drive, Border X Block Singapore 637553 Singapore
2. School of Electrical and Electronic Engineering; Nanyang Technological University; Singapore 639798 Singapore
3. Division of Physics and Applied Physics; School of Physical and Mathematical Sciences; Nanyang Technological University; 21 Nanyang Link Singapore 637371 Singapore
4. The Polymeric Biomaterials Lab; Feng Chia University; Taichung 40724 Taiwan
5. XLIM UMR CNRS 7252; Université de Limoges/CNRS; Limoges 87060 France
6. Institut d'Electronique; de Microélectronique et de Nanotechnologie (IEMN); CNRS UMR 8520 - Université de Lille 1; 59650 Villeneuve d'Ascq France
7. Department of Electronic Engineering; The Chinese University of Hong Kong; Hong Kong 999077
8. Aix Marseille University; CNRS, LP3 UMR 7341; Campus de Luminy; 163 Avenue de Luminy, Case 917 13288 Marseille cedex 9 France