1. Institute of Physics, Universidade Federal da Bahia, Campus Universitário da Federação, Rua Barão de Jeremoabo s/n, 40170-115 Salvador, BA, Brazil
2. Department of Exact Sciences and Education (CEE), Universidade Federal de Santa Catarina, Campus Blumenau, Rua João Pessoa, 2514, Velha, Blumenau 89036-004, SC, Brazil
3. Department of Electrical Engineering and Computer Science, University of Cincinnati, Cincinnati, Ohio 45221, USA