1 Biophotonics Laboratory, Institute of Physics of São Carlos, University of São Paulo (USP), São Carlos, São Paulo 13566-590, Brazil; PPG Biotec, Federal University of São Carlos (UFSCAR), São Carlos, São Paulo 13565-950, Brazil. Electronic address: dorapatriciaramirez@gmail.com.
2 Biophotonics Laboratory, Institute of Physics of São Carlos, University of São Paulo (USP), São Carlos, São Paulo 13566-590, Brazil.