1. Physics of Condensed Matter Group, Physics Department, Universidad Nacional de Colombia, A.A. 14490, Bogotá DC, Colombia
2. Centro Internacional de Física (CIF), A.A. 14490, Bogotá DC, Colombia
3. M. Sc. Program of Materials and Processes, Mechanics and Mechatronics Engineering Department, Universidad Nacional de Colombia, A.A. 14490, Bogotá DC, Colombia
4. Aplication Optical Group, Physics Department, Universidad Nacional de Colombia, A.A. 14490, Bogotá DC, Colombia