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Intensity-dependent enhancement of saturable absorption in PbS–Au4 nanohybrid composites: Evidence for resonant energy transfer by Auger recombination

Hendry I. Elim, Wei Ji, Jian Yang, Jim Yang Lee
2008 Applied Physics Letters  

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2008 pre-print arXiv:0806.1374v1 fatcat:2j4dg6jypbdbxpkv552vng5wp4
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
more » ... buted to excitation of surface plasmon by resonant energy transfer between PbS QDs and Au nanoparticles through Auger recombination.
doi:10.1063/1.2952273 fatcat:zq5brf2axrayjjbkvos5y3aw4q
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Hendry I. Elim, Wei Ji, Jian Yang, Jim Yang Lee. "Intensity-dependent enhancement of saturable absorption in PbS–Au4 nanohybrid composites: Evidence for resonant energy transfer by Auger recombination." Applied Physics Letters 92.25 (2008) 251106