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Title: Picosecond optical nonlinearity in monolayer-protected gold, silver, and gold-silver alloy nanoclusters
Authors: Philip, Reji
Kumar, G.R.
Sandhyarani, N.
Pradeep, T.
Issue Date: Nov-2000
Publisher: American Physical Society
Citation: Physical Review B, 2000, Vol.62, p13160-13166
Abstract: Monolayer-protected Au, Ag, and Au:Ag alloy nanoclusters have been synthesized using octanethiol and octadecanethiol as capping agents. The particle-size distribution is narrow with an average core size of 3-4 nm. Optical nonlinearity induced by 35 ps pulses at 532 nm has been investigated in these samples using the Z-scan technique. It is found that in general, they behave either as saturable absorbers or reverse saturable absorbers depending on the intensity of excitation. Au and Ag clusters show nearly the same efficiency for optical limiting, but the alloy clusters are found to be less efficient in limiting and are less photostable. The observed effects are explained in terms of the electron dynamics of the excited-state species.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 1098-0121
1550-235X (Online)
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Copyright: 2000 American Physical Society
Appears in Collections:Research Papers (LAMP)

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