Power Dependent of Nonlinear Absorption Coefficient of CdSe-Au Hybrid Nanocomposites

• 作者: Abeer Salah Iftitan Azzouz Mona Bakr Salah Hassabelnaby Yehia Badr
• 来源期刊: 光学与光子学期刊(英文)
• 学科: 物理学
• 关键词: Z-SCAN Nonlinear ABSORPTION Optical LIMITING CdSe:Au
• 年，卷（期）: 2015,（4）
• 页码范围: 125-135
• 页数: 11页
• 分类号: O4

摘要

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.