Effect of Au coating on optical properties of CdS nanoparticles and their optical limiting studies

被引：19

作者：

Mathew, S. ^{[1
]}

Samuel, Boni ^{[1
]}

Mujeeb, A. ^{[1
]}

Kailasnath, M. ^{[1
]}

Nampoori, V. P. N. ^{[1
]}

Girijavallabhan, C. P. ^{[1
]}

机构：

[1] Cochin Univ Sci & Technol, Int Sch Photon, Kochi 682022, Kerala, India

来源：

OPTICAL MATERIALS | 2017年 / 72卷

关键词：

CdS nanoparticles; Nonlinear optical absorption; Positive nonlinear refraction; Optical limiting; NONLINEAR ABSORPTION; NANOCRYSTALS; SATURATION; REFRACTION; ULTRAFAST; ZNO;

D O I：

10.1016/j.optmat.2017.07.016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We synthesized Au coated CdS nanoparticles by a novel synthesis route in which CdS is acting as a core. Transmission electron microscopy of the prepared CdS and Au coated nanoparticles shows that the size of the nanoparticles are in the range of 5 nm. TEM elemental maps of the Au coated CdS nanoparticles confirms the presence of Au nanoparticles on the surface of CdS nanoparticles. Nonlinear optical characteristics of these nanoparticles embedded in PVA thin films were studied by the Z-scan technique using Q-switched nanosecond Nd:YAG laser (532 nm). An enhancement in nonlinear optical property was observed for the prepared Au coated CdS embedded PVA nanocomposite films compared to that of bare CdS embedded PVA nanocomposite films. Nonlinear optical absorption coefficient and positive nonlinear refractive index of these films were measured to be 6.28 x 10(-6)cm/W and 4.86 x 10(-11) cm(2)/W respectively. Au coated CdS nanoparticles embedded PVA film possesses a low limiting threshold of 34 MW/cm(2) and also possess good positive nonlinear refractive index making suitable for optical limiting and optical switching applications. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：673 / 679

页数：7

共 27 条

[1] Exciton-Plasmon Interactions in Metal-Semiconductor Nanostructures [J].