1. LMER Laboratory, Faculty of Sciences, University Ibn Zohr, 80001 Agadir, Morocco
2. LabSIV Laboratory, Faculty of Sciences, University Ibn Zohr, 80001 Agadir, Morocco
3. Institut d’Electronique de Sud, IES, Equipe Micro-Capteurs, Université Montpellier II (CC 075), Place E. Bataillon, Cedex 05, 34095 Montpellier, France