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Spatially resolved random-access pump-probe microscopy based on binary holography

机译：基于二进制全息术的空间分辨随机接入泵探针显微镜

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摘要

In this Letter, we present a spatially resolved pump-probe microscope based on a digital micromirror device (DMD). The microscope system enables the measurements of ultrafast transient processes at arbitrarily selected regions in a 3-D specimen. To achieve random-access scanning, the wavefront of the probe beam is modulated by the DMD via binary holography. By switching the holograms stored in the DMD memory, the laser focus can be rapidly moved in space in a discrete fashion. The microscope system has a field of view of 65 x 130 x 155 mu m(3) in the x, y, and z axes, respectively; and a scanning speed of 8 kHz which is limited by the response time of the lock-in amplifier. To demonstrate the pump-probe system, we measured the ultrafast transient reflectivity of 2-D gold patterns on a silicon substrate and on silicon nitride cantilever beams. The results show an excellent signal-to-noise ratio and spatial-temporal resolution, as well as the 3-D random scanning capability. The new pump-probe microscope is a versatile instrument to characterize ultrafast 3-D phenomena with high spatial and temporal resolution, e.g., the propagation of localized surface plasmon resonance on curved surfaces. (C) 2019 Optical Society of America.
机译：在该信中，我们提出基于数字微镜器件（DMD）上的空间分辨的泵浦探针显微镜。显微镜系统使得能够在3-d样品在任意选择的区域超快瞬态过程的测量结果。为了实现随机存取扫描，探测光束的波阵面是由通过二进制全息的DMD调制。通过切换存储在DMD存储器的全息图，该激光焦点可以迅速地在空间中移动以离散的方式。显微镜系统的视的65 X 130 X 155亩的字段M（3）在x，y和z轴，分别;并且其由锁定放大器的响应时间的限制8kHz的扫描速度。为了证明泵浦 - 探测系统，我们测量的2-d金图案的超快瞬时反射率的硅衬底上和氮化硅的悬臂梁。结果显示出优异的信噪比和空间 - 时间分辨率，以及3-d随机扫描能力。新泵 - 探针显微镜是多功能仪器表征超快3-d现象以高空间和时间分辨率，例如，局域型表面等离子体共振的弯曲表面上的传播。 （c）2019年光学学会。

著录项

  • 来源
    《Optics Letters》 |2019年第16期|共4页
  • 作者

    Wen Chenyang; Feng Fu; Ren Mindan; Somekh Michael G.; Zhao Ni; Chen Shih-Chi;

  • 作者单位

    Chinese Univ Hong Kong Dept Mech &

    Automat Engn Shatin Hong Kong Peoples R China;

    Chinese Univ Hong Kong Dept Mech &

    Automat Engn Shatin Hong Kong Peoples R China;

    Chinese Univ Hong Kong Dept Mech &

    Automat Engn Shatin Hong Kong Peoples R China;

    Shenzhen Univ Coll Optoelect Engn Inst Micro &

    Nano Opt Key Lab Optoelect Devices &

    Syst Minist Educ &

    Gu Shenzhen 518060 Peoples R China;

    Chinese Univ Hong Kong Dept Elect Engn Shatin Hong Kong Peoples R China;

    Chinese Univ Hong Kong Dept Mech &

    Automat Engn Shatin Hong Kong 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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