TITLE:
Power Dependent of Nonlinear Absorption Coefficient of CdSe-Au Hybrid Nanocomposites
AUTHORS:
Abeer Salah, Mona Bakr, Salah Hassabelnaby, Iftitan Azzouz, Yehia Badr
KEYWORDS:
Z-Scan, Nonlinear Absorption, Optical Limiting, CdSe:Au
JOURNAL NAME:
Optics and Photonics Journal,
Vol.5 No.4,
April
15,
2015
ABSTRACT: Power
dependent study of optical nonlinear absorption coefficient of
semiconductor-plasmonic hybrid nanocomposites of CdSe:Au was investigated using
Z-scan technique, provided with nanosecond pulses of second harmonic Nd:YAG
laser. The prepared materials were characterized with linear absorption and
High Resolution Transmission Electron Microscope (HRTEM) which confirm the
quantum confinement of CdSe as well as the formation of CdSe:Au core shell
quantum dots. An analysis of power dependence open aperture Z-scan was
discussed. A change from saturable absorption (SA) to reverse saturable
absorption (RSA) is observed with increasing the laser power. Also, an
enhancement of the nonlinear absorption coefficient of CdSe:Au of larger sizes
compared to Au nanoparticles was detected.