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首页> 外文期刊>Nanotechnology >Two-photon-assisted excited state absorption in nanocomposite films of PbS stabilized in a synthetic glue matrix
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Two-photon-assisted excited state absorption in nanocomposite films of PbS stabilized in a synthetic glue matrix

机译：在合成胶基质中稳定的PbS纳米复合膜中的双光子辅助激发态吸收

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摘要

Strong nonlinear absorption is observed in nanocomposite films containing PbS nanocrystals of mean size of 3.3 nm stabilized in a commercial poly(vinyl acetate) glue by a novel and simple chemical route of synthesis. A significant blueshift of the optical absorption edge indicates strong quantum confinement. The mean nanocrystal size was characterized by x-ray diffraction and transmission electron microscopy. The surface structure of nanocrystals is analysed using infrared spectroscopy. The excitonic transitions are probed by photoacoustic spectroscopy and the results are analysed on the basis of theoretical calculations using envelope function formalism. Results of open aperture z-scan experiments suggest a model involving saturable absorption followed by two-photon absorption at a lower concentration while the data for a higher concentration fitted saturable absorption followed by three-photon absorption. Free carrier absorption due to two-photon-assisted excited state absorption appears to be the predominant mechanism of optical nonlinearity.
机译：通过新颖且简单的化学合成途径，在市售聚乙酸乙烯酯胶中稳定的平均粒径为3.3 nm的PbS纳米晶体的纳米复合薄膜中，观察到了强烈的非线性吸收。光学吸收边缘的明显蓝移表明较强的量子限制。平均纳米晶体尺寸通过X射线衍射和透射电子显微镜表征。使用红外光谱分析纳米晶体的表面结构。通过光声光谱探测激子跃迁，并在理论计算的基础上使用包络函数形式来分析结果。开孔z扫描实验的结果表明，该模型涉及一个饱和吸收，然后在较低浓度下进行两个光子吸收，而较高浓度的数据则拟合了一个饱和吸收，然后进行了三个光子吸收。由双光子辅助的激发态吸收引起的自由载流子吸收似乎是光学非线性的主要机理。

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