Nonlinear diffraction in gratings based on polymer–dispersed TiO2 nanoparticles
Nonlinear diffraction in gratings based on polymer–dispersed TiO2 nanoparticles
复制标题
基于聚合物分散的 TiO2 纳米颗粒的光栅中的非线性衍射
DOI：
10.1007/s00340-005-1873-7
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Stumpe
中科院分区：
文献类型：
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作者：
T. Smirnova;O. Sakhno;V. I. Bezrodnyj;J. Stumpe
在这封信中，我们报道了一种基于含有纳米二氧化钛的光聚合复合材料来制作体全息光栅的简单技术。由于高折射率纳米粒子在低折射率聚合物基质中的周期性分布，形成了高折射率调制幅度(高达1.2 5×10−2)的衍射光栅。随着纳米粒子浓度的增加，衍射效率显著提高。掺入10wt%的纳米二氧化钛，在可见光区获得了高的衍射效率、低的散射级和高的透过率。这将最终导致基于纳米复合材料的衍射光学元件的不同应用。研究了1064 nm探测激光脉冲强度对光栅衍射效率的影响。结果表明，这种非线性响应主要归因于镶嵌在聚合物基质中的纳米二氧化钛的非线性特性。讨论了光栅的形成机理和衍射效率非线性行为的原因。
In this letter we report a simple technique to produce volume holographic gratings based on photopolymerizable composites containing TiO2nanoparticles. Diffraction gratings with high refractive index modulation amplitude (up to 1.25 × 10−2) have been formed due to the periodic distribution of high refractive index nanoparticles in a low refractive index polymer matrix. The diffraction efficiency increases strongly on increasing the nanoparticle concentration. Taking the mixture with 10 wt.% TiO2nanoparticles, gratings with high diffraction efficiency, low level of scattering and high transparency in the visible-wavelength range have been obtained. This will ultimately lead to different applications of diffractive optical elements based on nanocomposites. The dependence of the gratings’ diffraction efficiency on the intensity of probe laser pulses at 1064 nm has been explored. It is shown that the nonlinear response of the gratings is attributed mainly to the nonlinear properties of the TiO2nanoparticles embedded in the polymer matrix. The mechanism of the grating formation and the reasons for the nonlinear behavior of the diffraction efficiency are discussed.