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Resolution enhanced photothermal imaging by high-order correlation

机译：分辨率通过高阶相关性增强了光热成像

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摘要

Laser scanning photothermal imaging offers a powerful non-destructive testing tool to visualize subsurface structures of opaque materials, but it suffers the resolution limit imposed by thermal diffusion. To overcome this physical obstacle, a tightly focused excitation beam with a high repetition rate is usually used to improve the spatial resolution. Here, we demonstrate that the resolution of photothermal imaging could be enhanced using the high-order correlation imaging method inspired by correlated optical imaging. By carefully designing the laser scanning and modulation behavior, we can individually control the statistical properties of isolated hotspots induced by lasers. Imaging reconstructions of subsurface structures are performed afterward by reading out time-fluctuated thermal images. Moreover, the resolution can be further enhanced by using the high-order correlation, which enables a new way for highly resolved thermal imaging and metrology applications. (C) 2020 Optical Society of America
机译：激光扫描光热成像提供了一种强大的非破坏性测试工具，可视化不透明材料的地下结构，但它受到热扩散施加的分辨率限制。为了克服这种物理障碍，通常用于改善空间分辨率的具有高重复速率的紧密激励梁。这里，我们证明可以使用由相关光学成像的高阶相关成像方法增强光热成像的分辨率。通过仔细设计激光扫描和调制行为，我们可以单独控制激光器引起的隔离热点的统计特性。之后通过读出时间波动的热图像来执行地下结构的成像重建。此外，通过使用高阶相关性可以进一步提高分辨率，这使得能够成为高度解决的热成像和计量应用的新方法。 （c）2020美国光学学会

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  • 来源
    《Optics Letters》 |2020年第20期|共4页
  • 作者

    Sunian Xiaobing; Liu Wei; Chen Lei; Zhou Zhihao; Shen Dongyi; Liu Yuehan; Wan Wenjie;

  • 作者单位

    Shanghai Jiao Tong Univ Univ Michigan Shanghai Jiao Tong Univ Joint Inst MOE Key Lab Laser Plasmas Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Dept Phys &

    Astron State Key Lab Adv Opt Commun Syst &

    Networks Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Dept Phys &

    Astron State Key Lab Adv Opt Commun Syst &

    Networks Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Univ Michigan Shanghai Jiao Tong Univ Joint Inst MOE Key Lab Laser Plasmas Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Dept Phys &

    Astron State Key Lab Adv Opt Commun Syst &

    Networks Shanghai 200240 Peoples R China;

    Johns Hopkins Univ Whiting Sch Engn Baltimore MD 21218 USA;

    Shanghai Jiao Tong Univ Univ Michigan Shanghai Jiao Tong Univ Joint Inst MOE Key Lab Laser Plasmas Shanghai 200240 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 计量学;光学;
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