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Proceedings Paper

Large nonlinear optical properties of ternary quantum dots and nanorods
Author(s): Hendry I. Elim; Wei Ji; Tian Lu; Meng-Tack Ng; Jagadese J. Vittal
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Paper Abstract

Recently there are many reports on the nonlinear optical (NLO) and electronics properties of semiconducting binary nanocrystals such as CdSe, PbS and CdS. In the spectral regime where the photon energy (ħω) is less than the bandgap (Eg), two photon absorption and two-photon-absorption-associated processes are dominant mechanisms. When ħω > Eg, however, saturable absorption due to band filling mechanism plays an important role. However, very few results related to optoelectronics properties on ternary nanocrystals are reported. Here, we present large NLO properties of ternary nanocrystals such as AgInS2 quantum dots (QDs) and AgInSe2 nanorods (NRs) studied by femtosecond laser pulse at 780 nm. By employing Z-scan and transient absorption techniques, the third-order susceptibility of AgInS2 QDs and AgInSe2 NRs has been measured to be as large as 10-8 esu. The origin of NLO properties in AgInS2 QDs is due to two photon absorption. While the NLO behavior of AgInSe2 NRs is mainly contributed by saturation in the nonlinear absorption and optical Kerr nonlinearity with a recovery time determined to be a few ten picoseconds.

Paper Details

Date Published: 15 September 2007
PDF: 12 pages
Proc. SPIE 6639, Nanophotonic Materials IV, 663903 (15 September 2007); doi: 10.1117/12.730934
Show Author Affiliations
Hendry I. Elim, National Univ. of Singapore (Singapore)
Wei Ji, National Univ. of Singapore (Singapore)
Tian Lu, National Univ. of Singapore (Singapore)
Meng-Tack Ng, National Univ. of Singapore (Singapore)
Jagadese J. Vittal, National Univ. of Singapore (Singapore)

Published in SPIE Proceedings Vol. 6639:
Nanophotonic Materials IV
Zeno Gaburro; Stefano Cabrini, Editor(s)

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