Linear and nonlinear optical properties of nanostructured Zn-(1_(x))SrxO-PVA composite thin films

Tamgadge Y. S.; Sunatkari A. L.; Talwatkar S. S.Pahurkar V. G.Muley G. G.

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Linear and nonlinear optical properties of nanostructured Zn-(1_(x))SrxO-PVA composite thin films

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We investigate the effect of strontium doping on the linear and third order nonlinear optical properties of ZnO-polyvinyl alcohol (PVA) nano-composite thin films. Strontium doped ZnO nanoparticles capped with L-arginine were synthesized by low cost soft chemical route. These nanoparticles were characterized by X-ray powder diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy for its crystal structure and surface morphology studies. Linear optical responses of these samples were studied by using ultraviolet-visible (UV-vis) spectroscopy and Fourier transform infrared (FT-IR) spectroscopy. Presence of excitonic peaks for doped and undoped ZnO was revealed by UV-vis data and shift of excitonic peaks towards lower energy with increase in dopant concentration was observed. Rotational and vibrational signatures of capping agent and ZnO were confirmed by FT-IR spectroscopy. Third order nonlinearity (nonlinear refraction and absorption) of Zn((1)_(x))Sr-x,O-PVA thin films, deposited on the good optical quality glass substrate, were studied by z-scan technique using He-Ne laser (wavelength 632.8 nm) in continuous wavelength regime which shows negative nonlinearity with self-defocusing effect. The large value of n(2) (10(-4) cm(2)/W) is obtained for 5 wt strontium doped ZnO-PVA thin film and is attributed to the thermal effect. Enhanced nonlinear absorption due to reverse saturable absorption and weak free carrier absorption is observed for all undoped and doped ZnO-PVA thin films and is prominent for 5 wt doping of strontium. Third order nonlinear susceptibility (x) is calculated for all samples. (C) 2014 Elsevier B.V. All rights reserved.

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来源
《Optical materials》 |2014年第11期|42-50|共9页
作者
Tamgadge Y. S.; Sunatkari A. L.; Talwatkar S. S.Pahurkar V. G.Muley G. G.;
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作者单位

Sant Gadge Baba Amravati Univ, Dept Phys, Amravati 444602, MS, India;

Shri Shivaji Coll, Dept Phys, Akola 444003, MS, India;

Siddharth Coll, Dept Phys, Mumbai 440001, MS, IndiaDK Marathe & HG Acharya Coll, Dept Phys, Bombay 440071, Maharashtra, India;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类工程基础科学;
关键词
ZnO nanoparticles; z-Scan; Nonlinear refraction; Nonlinear absorption; X-ray diffraction; Spin coating;

Linear and nonlinear optical properties of nanostructured Zn-(1_(x))SrxO-PVA composite thin films

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