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Title: Optical nonlinearity in lead sulfide microtowers
Authors: Tamilselvan, V.
Sridharan, Kishore
Rao, Narasimha K.
Philip, Reji
Issue Date: 29-Sep-2010
Publisher: IOP Publishing Ltd.
Citation: Journal of Physics D: Applied Physics, 2010, Vol.43, 385402
Abstract: Lead sulfide (PbS) microtowers on silicon substrates, having the physical properties of bulk PbS, have been synthesized. Optical nonlinearity studies using the open aperture z-scan technique employing 5 ns and 100 fs laser pulses reveal effective two-photon type absorption. For nanosecond excitation the nonlinear absorption coefficients (βeff) are in the order of 10−11 m W−1, two orders of magnitude less than the values reported for quantum confined PbS nanocrystals. For femtosecond excitation βeff is of the order of 10−14 m W−1. These results obtained in bulk PbS experimentally confirm the importance of quantum confinement in the enhancement of optical nonlinearities in semiconductor materials
Description: Restricted Access.
ISSN: 0022-3727
1361-6463 (Online)
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Copyright: 2010 IOP Publishing Ltd.
Appears in Collections:Research Papers (LAMP)

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