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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Enhancement of Third-Order Optical Nonlinearities in 3-Dimensional Films of Dielectric Shell Capped Au Composite Nanoparticles
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Enhancement of Third-Order Optical Nonlinearities in 3-Dimensional Films of Dielectric Shell Capped Au Composite Nanoparticles

机译：介电壳包覆的Au复合纳米粒子三维膜中三阶光学非线性的增强

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摘要

The composite nanoparticles of Au-core capped by CdS shells of different thickness were prepared and assembled into densely packed 3-dimensional films by the layer-by-layer self-assembly (LBL) technique.These films exhibited the 3-dimensional structure of densely packed AuCdS composite nanoparticles and the shell thickness was tunable by changing the concentration of Cd~(2+)-thiourea complexes.These multilayer films exhibited enhanced third-order optical nonlinear responses and ultrafast response times (several picoseconds).The third-order nonlinear optical susceptibility of the film with the CdS shell thickness of 4.4 nm was estimated to be 1.48 x 10~(-9) esu and the value decreases with the increase of the CdS shell thickness.The enhancement of the optical nonlinearity was explained based on the calculation according to the electrostatic approximation by the solution of Laplace's equation under the boundary conditions appropriate to the model of core-shell nanoparticles,and mainly attributed to localized electric field effects in the CdS shell region.Additionally,the nonlinearity was optimized by determination of the values of the dielectric constant and thickness of the different shell.
机译：制备了不同厚度的CdS壳包覆的Au核复合纳米颗粒，并通过逐层自组装（LBL）技术组装成致密堆积的三维薄膜，这些薄膜呈现出致密的三维结构。通过改变Cd〜（2 +）-硫脲配合物的浓度可调节AuCdS复合纳米颗粒的壳厚度，这些多层膜表现出增强的三阶光学非线性响应和超快响应时间（几皮秒）。 CdS壳厚度为4.4 nm的薄膜的光学磁化率估计为1.48 x 10〜（-9）esu，随着CdS壳厚度的增加，该值减小。在适合核-壳纳米粒子模型的边界条件下，通过拉普拉斯方程的解根据静电近似法进行计算此外，通过确定不同壳的介电常数和厚度来优化非线性。

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