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Powerdependent study of optical nonlinear absorption coefficient ofsemiconductor-plasmonic hybrid nanocomposites of CdSe:Au was investigated usingZ-scan technique, provided with nanosecond pulses of second harmonic Nd:YAGlaser. The prepared materials were characterized with linear absorption andHigh Resolution Transmission Electron Microscope HRTEM which confirm thequantum confinement of CdSe as well as the formation of CdSe:Au core shellquantum dots. An analysis of power dependence open aperture Z-scan wasdiscussed. A change from saturable absorption SA to reverse saturableabsorption RSA is observed with increasing the laser power. Also, anenhancement of the nonlinear absorption coefficient of CdSe:Au of larger sizescompared to Au nanoparticles was detected.

KEYWORDS

Z-Scan, Nonlinear Absorption, Optical Limiting, CdSe:Au

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Salah, A. , Bakr, M. , Hassabelnaby, S. , Azzouz, I. and Badr, Y. 2015 Power Dependent of Nonlinear Absorption Coefficient of CdSe-Au Hybrid Nanocomposites. Optics and Photonics Journal, 5, 125-135. doi: 10.4236-opj.2015.54012.





Autor: Abeer Salah*, Mona Bakr, Salah Hassabelnaby, Iftitan Azzouz, Yehia Badr

Fuente: http://www.scirp.org/



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