1 research outputs found
Dynamics, Efficiency, and Energy Distribution of Nonlinear Plasmon-Assisted Generation of Hot Carriers
We employ nonlinear autocorrelation
measurements to investigate
plasmon-assisted hot carrier dynamics occurring in optical gold antennas.
A nonlinear formation of hot carriers is produced by the excitation
of surface plasmons, providing thus a unique lever to optimize the
energy distribution and generation efficiency of the photoexcited
charges. The temporal response of the carriersā relaxation
is controlled within a range extending from 500 fs to 2.5 ps. By conducting
a quantitative analysis of the dynamics, we determine the nonlinear
absorption cross-section of individual optical antennas. This work
sheds new insights on the understanding of plasmon-induced hot carrier
generation, especially in view of applications where the time response
plays a preponderant role