Synthesis and nonlinear optical properties of Lead Telluride nanorods

Sridharan, Kishore and Tamilselvan, V and Yuvaraj, D and Rao, Narasimha K and Philip, Reji (2012) Synthesis and nonlinear optical properties of Lead Telluride nanorods. In: Optical Materials, 34 (4). pp. 639-645.

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Abstract

Lead Telluride (PbTe) nanorods have been uniformly grown on silicon substrates, using the thermal evaporation technique under high vacuum conditions. The structural and morphological studies are done using X-ray diffraction and scanning electron microscopy. Optical nonlinearity studies using the open aperture z-scan employing 5 ns and 100 fs laser pulses reveal a three-photon type absorption. For nanosecond excitation the nonlinear absorption coefficients (gamma) are in the order of 10(-22) m(3) W-2 and for femtosecond excitation it is in the order of 10(-29) m(3) W-2. The role of free carriers and excitons in causing the nonlinearity in both excitation time domains is discussed. Results indicate that PbTe nanorods are good optical limiters with potential device applications. (C) 2011 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	Optical Materials
Publisher:	Elsevier Science B.V.
Additional Information:	Copyright of this article belongs to Elsevier Science B.V.
Keywords:	Lead Telluride;Nanorods;Nonlinear optics;Z-scan;Optical limiting;Three-photon absorption
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	02 Mar 2012 11:05
Last Modified:	02 Mar 2012 11:05
URI:	http://eprints.iisc.ac.in/id/eprint/43705

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