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dc.contributor.authorThomas, Jinto-
dc.contributor.authorAnija, M.-
dc.contributor.authorCyriac, Jobin-
dc.contributor.authorPradeep, T.-
dc.contributor.authorPhilip, Reji-
dc.identifier.citationPhotonics-2004: Proceedings of the 7th international conference on optoelectronics, fiber optics and photonics held at Cochin, December, 2004en
dc.descriptionRestricted Access.en
dc.description.abstractThe optical nonlinearity in nanoclusters of Au@hexanethiol and Au@dodecanethiol has been investigated. From the mass spectra, each cluster is estimated to contain between 29 to 40 atoms of gold. The optical absorption spectra of the clusters are devoid of the plasmon absorption band, and show a gradual increase in absorbance towards the UV region. When excited with nanosecond laser pulses at 532 nm, an optical limiting behavior is observed, which fits to a threephoton absorption mechanism. We propose that this nonlinearity is caused by free carrier absorption subsequent to twophoton absorption taking place in the medium. The temporal dynamics of the nonlinearity reveals a fast process, with a lifetime of less than 2 picosecondsen
dc.format.extent69174 bytes-
dc.rights2004 Photonicsen
dc.subjectmetal nanoclustersen
dc.subjectoptical limitingen
dc.subjecttwo-photon absorptionen
dc.subjectfree carrier absorptionen
dc.subjecttemporal dynamicsen
dc.titleObservation of a fifth order optical nonlinearity in 29 kDa Au@alkanethiol clustersen
Appears in Collections:Research Papers (LAMP)

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