1. Graduate Program of Electrical Engineering, Federal University of Espírito Santo, Vitória, Brazil
2. Photonics and Optical Sensing Research Laboratory, Cyprus University of Technology, Limassol, Cyprus
3. Mechanical Engineering Department, Federal University of Espírito Santo, Vitória, Brazil
4. Physics Department and i3N, University of Aveiro, Campus Universitário de Santiago, Aveiro, Portugal