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Investigation of the nonlocal nonlinear optical response of copper nanostructured thin films prepared by pulsed laser deposition

机译：脉冲激光沉积制备铜纳米结构薄膜的非局部非线性光学响应研究

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Nanostructured copper thin films have been prepared using the pulsed laser deposition method. Optical absorption spectra of these films exhibit plasmonic absorption peaks around 619 nm, which suggests the formation of copper nanoparticles on their surfaces. Scanning electron micrographs of the films confirm the nanoparticle formation on the films surfaces. After laser beam passing through the thin films, the observed diffraction rings on a far-field screen have been recorded. Despite the smallness of the maximal axial phase shifts of the films, which have been obtained using the nonlocal z-scan theory, a series of low-intensity rings can be observed on the far field screen for some specific positions of the thin films from the focal point. It is shown that the best approach to determining the sign and magnitude of the nonlinear refractive index of thin samples is the application of the conventional closeaperture z-scan method.
机译：已经使用脉冲激光沉积方法制备了纳米结构的铜薄膜。这些薄膜的光吸收光谱在619 nm附近显示等离子体吸收峰，这表明在其表面形成了铜纳米颗粒。膜的扫描电子显微照片证实了纳米颗粒在膜表面上的形成。激光束穿过薄膜后，已在远场屏幕上记录了观察到的衍射环。尽管使用非局域z扫描理论获得的薄膜最大轴向相移很小，但在远场屏幕上仍可从薄膜的某些特定位置观察到一系列低强度环。焦点。结果表明，确定薄样品非线性折射率的正负号和大小的最佳方法是采用常规的近孔径z扫描方法。

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