太赫兹傅里叶光谱成像
Terahertz Fourier Ptychographic Imaging
AI总结：
本研究提出了一种无需大幅修改硬件的太赫兹傅里叶光谱成像方法，通过多角度平面波照明和傅里叶域算法实现高分辨率成像，为材料表征和非破坏性测试提供了新途径。
摘要：
太赫兹频段的高分辨率成像仍然受到现有最先进成像器有限数值孔径的限制，这限制了其在许多领域中的应用，例如在复杂介质中的成像或非破坏性测试。为了解决这一挑战，我们引入了太赫兹傅里叶光谱成像的可行性实现，以在不进行大量硬件修改的情况下提高空间分辨率。我们的方法使用电机驱动的运动镜生成一系列受控的多角度平面波照明，每个所产生的斜入射强度图像编码了目标成像样品空间频率内容的有限部分。这些测量在傅里叶域中通过集成了高效照明校准方案的衍射校正迭代相位检索算法进行组合，从而通过有效数值孔径的合成扩展来重建高分辨率的振幅和相位图像。我们的工作建立了一个稳健的高分辨率太赫兹成像框架，并为材料表征、光谱学和非破坏性评估等广泛应用铺平了道路。
英文摘要：
High-resolution imaging in the terahertz (THz) spectral range remains fundamentally constrained by the limited numerical apertures of currently existing state-of-the-art imagers, which restricts its applicability across many fields, such as imaging in complex media or nondestructive testing. To address this challenge, we introduce a proof-of-concept implementation of THz Fourier Ptychographic imaging to enhance spatial resolution without requiring extensive hardware modifications. Our method employs a motorized kinematic mirror to generate a sequence of controlled, multi-angle plane-wave illuminations, with each resulting oblique-illumination intensity image encoding a limited portion of the spatial-frequency content of the target imaging sample. These measurements are combined in the Fourier domain using an aberration-corrected iterative phase-retrieval algorithm integrated with an efficient illumination calibration scheme, which enables the reconstruction of resolution-enhanced amplitude and phase images through the synthetic expansion of the effective numerical aperture. Our work establishes a robust framework for high-resolution THz imaging and paves the way for a wide array of applications in materials characterization, spectroscopy, and non-destructive evaluation.
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