Publications de Camilla Bonati

Sub-picosecond polychromatic photoluminescence studies of CdSe and PbSe nanodots

Majed Chergui, Frank van Mourik, Andrea Cannizzo, Camilla Bonati

We present our studies of femtosecond photoluminescence of colloidal solns. of CdSe and PbSe nanocrystals, using polychromatic fluorescence upconversion. Ultrafast relaxation processes are obsd. in both cases upon excitation at 400 nm and 800 nm resp. Unde ...

2008

Subpicosecond near-infrared fluorescence upconversion study of relaxation processes in PbSe quantum dots

Majed Chergui, Frank van Mourik, Andrea Cannizzo, Camilla Bonati

The (sub)-ps relaxation processes in PbSe quantum dots of different sizes were measured by near-IR luminescence upconversion. The early-time spectra are characterized by emission from several low-lying excited states. The direct measurement of the Huang-Rh ...

2007

Ultrafast carrier and lattice dynamics in semiconductor and metal nanocrystals

Camilla Bonati

This thesis presents an experimental study of the time-resolved optical response of three different nanoscale systems: CdSe and PbSe quantum dots, and silver triangular nanoplates. The first part of the thesis is devoted to the understanding of the effects ...

EPFL2007

Time-Resolved Photodynamics of Triangular-Shaped Silver Nanoplates

Majed Chergui, Frank van Mourik, Camilla Bonati, Andrea Callegari, Luigi Bonacina

The authors measured the ultrafast response of triangular silver nanoparticles upon femtosecond excitation of their plasmon resonance. After a fast electron relaxation, the signature of a bimodal mech. vibration of the particle is apparent as a spectral mo ...

2006

Spectral and dynamical characterization of multiexcitons in colloidal CdSe semiconductor quantum dots

Majed Chergui, Frank van Mourik, Goran Zgrablic, Camilla Bonati

Femtosecond photoluminescence (PL) up-conversion studies in polychromatic mode and laser-power-dependence studies of the PL were carried out on colloidal solutions of CdSe quantum dots with diameters ranging from 2.4 to 4 nm. The main features of the spect ...

2005