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Title: Synthesis and nonlinear optical properties of Lead Telluride nanorods
Authors: Sridharan, Kishore
Tamilselvan, V.
Yuvaraj, D.
Narasimha Rao, K.
Philip, Reji
Issue Date: Feb-2012
Publisher: Elsevier B. V.
Citation: Optical Materials, 2012, Vol.34, p639-645
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 (γ) are in the order of 10-22 m3 W-2 and for femtosecond excitation it is in the order of 10-29 m3 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.
Description: Restricted Access.
ISSN: 0925-3467
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Copyright: 2012 Elsevier B. V.
Appears in Collections:Research Papers (LAMP)

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