Anisotropic and enhanced absorptive nonlinearities in a macroscopic film induced by aligned gold nanorods

Jiafang Li; Siyun Liu; Ye Liu; Fei Zhou; Zhi-Yuan Li
June 2010
Applied Physics Letters;6/28/2010, Vol. 96 Issue 26, p263103
Academic Journal
Anisotropic and enhanced nonlinear absorption (NLA) has been observed from aligned gold nanorods (GNRs) embedded in a poly(vinyl alcohol) film, which was realized by a stretched-film method. Open-aperture Z-scan experiments revealed that the stretch process enhanced the NLA coefficient by approximately nine times and increased the anisotropic factor of NLA to ∼20. The enhancement in the NLA coefficient reached as high as ∼91 times after increasing the concentration of GNRs by four times and this is attributed to the plasmonic interaction between densely packed GNRs.


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