Physics – Optics
Scientific paper
2008-06-09
Appl. Phys. Lett. 92, 251106 (2008)
Physics
Optics
14 pages, 3 figures. Accepted in Appl. Phys. Lett. (2008)
Scientific paper
10.1063/1.2952273
Intensity-dependent enhancement of saturable absorption in a film of PbS-Au4 nanohybrid composites has been observed by femtosecond time-resolved transient absorption measurement at 780 nm. The nonlinear absorption coefficient of saturable absorption in PbS-Au4 nanohybrid composites is found to be dependent on excitation irradiance and it is determined to be -2.9 cm/GW at 78 GW/cm2, an enhancement of nearly fourfold in comparison with that of pure PbS quantum dots (QDs). The enhancement is attributed to excitation of surface plasmon by resonant energy transfer between PbS QDs and Au nanoparticles through Auger recombination.
Elim Hendry I.
Ji Wei
Lee Jim Yang
Yang Jian
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