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

被引：22

作者：

Elim, Hendry I. ^{[1
]}

Ji, Wei ^{[1
]}

Yang, Jian ^{[2
]}

Lee, Jim Yang ^{[2
]}

机构：

[1] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

[2] Natl Univ Singapore, Depat Chem & Biomol Engn, Singapore 117576, Singapore

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 25期

关键词：

D O I：

10.1063/1.2952273

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Intensity-dependent enhancement of saturable absorption in a film of PbS-Au-4 nanohybrid composites has been observed by femtosecond time-resolved transient absorption measurement at 780 nm. The nonlinear absorption coefficient (alpha(2)) of saturable absorption in PbS-Au-4 nanohybrid composites is found to be dependent on excitation irradiance and it is determined to be -2.9 cm/GW at 78 GW/cm(2), an enhancement of nearly fourfold in comparison with that of pure PbS quantum dots (QDs). The enhancement is attributed to the excitation of surface plasmon by resonant energy transfer between PbS QDs and Au nanoparticles through Auger recombination. (C) 2008 American Institute of Physics.

引用

页数：3

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