Optical nonlinearity in lead sulfide microtowers

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4049

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.
URI:	http://hdl.handle.net/2289/4049
ISSN:	0022-3727 1361-6463 (Online)
Alternative Location:	http://iopscience.iop.org/0022-3727/43/38/385402 http://adsabs.harvard.edu/abs/2010JPhD...43L5402T
Copyright:	2010 IOP Publishing Ltd.
Appears in Collections:	Research Papers (LAMP)

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