Plasmon enhanced second harmonic generation in mixed semiconductor/ metal nanoparticles

CATALINA VON BILDERLING; A. V. BRAGAS

Buenos Aires, Argentina

Conferencia; NFO10, 10th Internacional on Near Field Optics, Nanophotonics and Related Techniques; 2008

LABORATORIO DE ELECTRONICA CUANTICA - UBA

We present measurements of the optical second-harmonic generation (SHG) in colloidal semiconductor quantum dots (QDs), metal nanoparticles (NPs) and mixed QDs-NPssystems. The experiments are performed in transmission, using a tunable modelocked Ti:Sa laser. We did not detect second harmonic (SH) signal for any of the centrosymetric NPsamples, and obtained a small SH peak for the QDs (non-centrosymetric). Conversely, we observed a strong SH response for the mixed QDs-NPs systems, enhanced by more than oneorder of magnitude respect to the QDs signal.