Optical nonlinearity in lead sulfide microtowers

Tamilselvan, V and Sridharan, Kishore and Rao, Narasimha K and Philip, Reji (2010) Optical nonlinearity in lead sulfide microtowers. In: Journal of Physics D: Applied Physics, 43 (38).

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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 (beta(eff)) 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 beta(eff) 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.

Item Type:	Journal Article
Publication:	Journal of Physics D: Applied Physics
Publisher:	Institute of Physics
Additional Information:	Copyright of this article belongs to Institute of Physics.
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	18 Oct 2010 07:32
Last Modified:	18 Oct 2010 07:32
URI:	http://eprints.iisc.ac.in/id/eprint/33129

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