1. Federal University of Campina Grande, Rua Aprigío Veloso 882, 58429-900 Campina Grande, PB, Brazil
2. Université Grenoble Alpes, LCIS, 50 rue de Laffemas, BP 54, Valence Cedex, 26902 Rhône-Alpes, France
3. Center for Semiconductor Components, UNICAMP, P.O. Box 6061, 13083-870 Campinas, SP, Brazil