1. Université de Montpellier, IES, UMR 5214, F-34000 Montpellier, France
2. CNRS, IES, UMR 5214, F-34000 Montpellier, France
3. Renewable Energy and Applied Photonics Laboratories, Electrical and Computer Engineering Department, Tufts University, Medford, Massachusetts 02155, USA
4. ONERA, Chemin de la Hunière, 91761 Palaiseau, France