TY - JOUR
T1 - Ultrafast optical mapping of nonlinear plasmon dynamics in Cu 2-xSe nanoparticles
AU - Della Valle, Giuseppe
AU - Scotognella, Francesco
AU - Kandada, Ajay Ram Srimath
AU - Zavelani-Rossi, Margherita
AU - Li, Hongbo
AU - Conforti, Matteo
AU - Longhi, Stefano
AU - Manna, Liberato
AU - Lanzani, Guglielmo
AU - Tassone, Francesco
PY - 2013/10/3
Y1 - 2013/10/3
N2 - 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.
AB - 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.
KW - heavily doped semiconductors
KW - nanocrystals
KW - nonthermalized carriers
KW - plasmonics
KW - pump-probe spectroscopy
KW - two temperature model
UR - http://www.scopus.com/inward/record.url?scp=84885100194&partnerID=8YFLogxK
U2 - 10.1021/jz401862v
DO - 10.1021/jz401862v
M3 - Article
AN - SCOPUS:84885100194
SN - 1948-7185
VL - 4
SP - 3337
EP - 3344
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 19
ER -