Closed-Aperture Z-Scan Analysis for Nonlinear Media with Saturable Absorption and Simultaneous Third- and Fifth-Order Nonlinear Refraction
Closed-Aperture Z-Scan Analysis for Nonlinear Media with Saturable Absorption and Simultaneous Third- and Fifth-Order Nonlinear Refraction
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DOI：
10.1155/2012/161572
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发表时间：
2012-08
期刊：
影响因子：
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通讯作者：
Xiangming Liu;Y. Tomita
中科院分区：
文献类型：
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作者：
Xiangming Liu;Y. Tomita
我们提出了一种用于具有可饱和吸收和高阶非线性折射的非线性光学材料的开孔径和闭孔径高斯光束 Z 扫描理论。我们证明，通过 Adomian 分解方法和薄膜近似，可以得出通过非线性光学材料的透射强度的近似表达式。该理论应用于半导体 CdSe 量子点聚合物纳米复合薄膜。结果表明，该理论很好地解释了 Z 扫描设置中开孔和闭孔透射率的测量结果。还表明，纳米复合薄膜同时具有三阶和五阶非线性折射以及均匀展宽型的饱和吸收。
We present a theory of open- and closed-aperture Gaussian beam Z-scan for nonlinear optical materials with saturable absorption and high-order nonlinear refraction. We show that an approximate expression for a transmitted intensity through the nonlinear optical material is possible by means of the Adomian’s decomposition method and the thin film approximation. The theory is applied to semiconductor CdSe quantum dot-polymer nanocomposite films. It is shown that the theory well explains measured results of open- and closed-aperture transmittances in the Z-scan setup. It is also shown that the nanocomposite film possesses simultaneous third- and fifth-order nonlinear refraction as well as saturable absorption of a homogeneously broadened type.