Nano Archive

Picosecond optical nonlinearity in monolayer-protected gold, silver, and gold-silver alloy nanoclusters

Philip , Reji and Kumar, G. Ravindra and Sandhyarani , N. and Pradeep, T. (2000) Picosecond optical nonlinearity in monolayer-protected gold, silver, and gold-silver alloy nanoclusters. PHYSICAL REVIEW B, 62 (19). 13160 -13166. ISSN 10980121

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Official URL: http://prola.aps.org/abstract/PRB/v62/i19/p13160_1

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.

Item Type:Article
Subjects:Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:4507
Deposited By:JNCASR
Deposited On:02 Apr 2009 05:14
Last Modified:02 Apr 2009 05:14

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