We report on the experimental investigation and theoretical modeling of the ultrafast nonlinear optical response exhibited by Cu2−xSe nanoparticles in a broad range of wavelengths, from the red to the near-infrared, under excitation with intense femtosecond-laser pulses. The ultrafast dynamics of the localized plasmon resonance of the system is mapped by pump−probe differential transmission measurements. Deviations from theoretical predictions based on standard two-temperature model (TTM) are revealed in the subpicosecond time-scale where the nonlinear phenomenon is more pronounced. The key-role played by nonthermalized carriers is investigated in detail on the basis of an extended TTM

Ultrafast Optical Mapping of Nonlinear Plasmon Dynamics in Cu2–xSe Nanoparticles

DELLA VALLE, GIUSEPPE;SCOTOGNELLA, FRANCESCO;ZAVELANI ROSSI, MARGHERITA;LONGHI, STEFANO;LANZANI, GUGLIELMO;
2013

Abstract

We report on the experimental investigation and theoretical modeling of the ultrafast nonlinear optical response exhibited by Cu2−xSe nanoparticles in a broad range of wavelengths, from the red to the near-infrared, under excitation with intense femtosecond-laser pulses. The ultrafast dynamics of the localized plasmon resonance of the system is mapped by pump−probe differential transmission measurements. Deviations from theoretical predictions based on standard two-temperature model (TTM) are revealed in the subpicosecond time-scale where the nonlinear phenomenon is more pronounced. The key-role played by nonthermalized carriers is investigated in detail on the basis of an extended TTM
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/755509
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