We propose a new approach of using carbon nanoparticles for correlation optical diagnostics of а complex scalar optical field created by scattering and diffraction of radiation off a rough surface. This surface is simulated and we generate a diffraction pattern of the amplitude and phase distribution in the far field. Carbon nanoparticles of a certain size and concentration are obtained by the bottom-up methods of hydrothermal synthesis of citric acid and urea followed by centrifugation. The optical properties of carbon nanoparticles, such as luminescence and absorption in the visible spectrum that essentially differs for different wavelengths, as well as particle size of about dozen nanometers, are the determining criteria for using these particles as probes for the optical speckle field. Luminescence made it possible to register the coordinate position of carbon nanoparticles in real time. The algorithm for reconstruction of the scalar optical field intensity distribution through the analysis of the nanoparticle positions is here displayed. The skeleton of the optical speckle field is analyzed by Hilbert transform to restore the phase. Special attention is paid to the restoration of the speckle field’s phase singularities.

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使用碳纳米颗粒的随机物体光学场诊断

我们提出了一种使用碳纳米颗粒对复杂标量光场进行相关光学诊断的新方法，该复杂标量光场是由粗糙表面上的辐射散射和衍射产生的。模拟该表面，我们生成远场中振幅和相位分布的衍射图。通过水热合成柠檬酸和尿素，然后离心的自下而上的方法获得了一定大小和浓度的碳纳米颗粒。碳纳米颗粒的光学特性，例如可见光谱中的发光和吸收，对于不同的波长而言，这些特性本质上是不同的，以及大约十几纳米的粒度，是将这些颗粒用作光学散斑场探针的确定标准。发光使实时记录碳纳米颗粒的坐标位置成为可能。这里显示了通过分析纳米粒子位置重建标量光场强度分布的算法。通过希尔伯特变换分析光学散斑场的骨架，以恢复相位。要特别注意恢复散斑场的相位奇异性。