...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Optical Materials >Linear and nonlinear optical properties of nanostructured Zn_((1-x))Sr_xO-PVA composite thin films
【24h】

Linear and nonlinear optical properties of nanostructured Zn_((1-x))Sr_xO-PVA composite thin films

机译：纳米Zn _（（1-x））Sr_xO-PVA复合薄膜的线性和非线性光学性质

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

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 exci-tonic 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 non-linearity (nonlinear refraction and absorption) of Zn_(1-x)Sr_xO-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_(eff)~((3))) is calculated for all samples.
机译：我们研究了锶掺杂对ZnO-聚乙烯醇（PVA）纳米复合薄膜的线性和三阶非线性光学特性的影响。通过低成本的软化学方法合成了掺有L-精氨酸的锶掺杂ZnO纳米粒子。这些纳米颗粒通过X射线粉末衍射，扫描电子显微镜和能量色散X射线光谱进行表征，以进行晶体结构和表面形态研究。这些样品的线性光学响应通过紫外可见光谱和傅里叶变换红外光谱进行了研究。 UV-vis数据揭示了掺杂和未掺杂ZnO的激子峰的存在，并且观察到随着掺杂剂浓度的增加，激子峰向较低能量的移动。 FT-IR光谱证实了封端剂和ZnO的旋转和振动特征。使用He-Ne激光（波长632.8 nm）通过z扫描技术研究了沉积在光学质量优良的玻璃基板上的Zn_（1-x）Sr_xO-PVA薄膜的三阶非线性（非线性折射和吸收）。在连续波长范围内表现出负非线性和自散焦效应。掺锶5重量％的ZnO-PVA薄膜的n_2值较大（10〜（-4）cm〜2 / W），归因于热效应。对于所有未掺杂和掺杂的ZnO-PVA薄膜，观察到由于反向饱和吸收和弱的自由载流子吸收而导致的增强的非线性吸收，并且对于5 wt％的锶掺杂而言，这是突出的。计算所有样本的三阶非线性磁化率（X_（eff）〜（（3）））。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号