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Third-order nonlinear optical response in PbS-coated CdS nanocomposites

Published online by Cambridge University Press:  31 January 2011

Bing Liu ,
Chwee Har Chew ,
Leong Ming Gan ,
Guo Qin Xu ,
Heping Li ,
Yee Loy Lam ,
Chan Hin Kam  and
Wen Xiu Que
Bing Liu
Affiliation:
Department of Chemistry, National University of Singapore, 10 Kent Ridge Crescent, Republic of Singapore 119260
Chwee Har Chew
Affiliation:
Department of Chemistry, National University of Singapore, 10 Kent Ridge Crescent, Republic of Singapore 119260
Leong Ming Gan
Affiliation:
Department of Chemistry, National University of Singapore, 10 Kent Ridge Crescent, Republic of Singapore 119260
Guo Qin Xu*
Affiliation:
Department of Chemistry, National University of Singapore, 10 Kent Ridge Crescent, Republic of Singapore 119260
Heping Li
Affiliation:
school of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Republic of Singapore 639798
Yee Loy Lam
Affiliation:
school of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Republic of Singapore 639798
Chan Hin Kam
Affiliation:
school of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Republic of Singapore 639798
Wen Xiu Que
Affiliation:
school of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Republic of Singapore 639798
*
a)Address all correspondence to this author.
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Abstract

PbS-coated CdS nanocomposite particles were synthesized by an ion displacement method in an inverse microemulsion. Their growth kinetics were studied with UV–vis spectroscopy. Transmission electron microscopic characterization shows that PbS-coated CdS particles are uniform in size with a mean diameter of 6 nm. The electron diffraction patterns demonstrate their crystalline nature. Third-order nonlinear optical properties in the samples were investigated using the Z-scan technique with femtosecond laser pulses at 780-nm wavelength. The nonlinear refractive index of PbS-coated CdS nanocomposite particles in microemulsion varied with the molar ratio of Cd/Pb ions and reached a maximum of 5.3 × 10−12 cm2/GW for the sample with a Cd/Pb ion ratio of 1 to 2. The observed large refractive nonlinearity in these nanocomposite particles may be attributed to the optical Stark effect and strong interfacial and inter-nanoparticle interactions.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 6 , June 2001 , pp. 1644 - 1650
Copyright
Copyright © Materials Research Society 2001

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