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Fast topographic optical imaging using encoded search focal scan

Author

Listed:
  • Narcís Vilar

    (Parc audiovisual de Catalunya
    Universitat de Barcelona)

  • Roger Artigas

    (Parc audiovisual de Catalunya)

  • Martí Duocastella

    (Universitat de Barcelona)

  • Guillem Carles

    (Parc audiovisual de Catalunya)

Abstract

A central quest in optics is to rapidly extract quantitative information from a sample. Existing topographical imaging tools allow non-contact and three-dimensional measurements at the micro and nanoscales and are essential in applications including precision engineering and optical quality control. However, these techniques involve acquiring a focal stack of images, a time-consuming process that prevents measurement of moving samples. Here, we propose a method for increasing the speed of topographic imaging by orders of magnitude. Our approach involves collecting a reduced set of images, each integrated during the full focal scan, whilst the illumination is synchronously modulated during exposure. By properly designing the modulation sequence for each image, unambiguous reconstruction of the object height map is achieved using far fewer images than conventional methods. We describe the theoretical foundations of our technique, characterise its performance, and demonstrate sub-micrometric topographic imaging over 100 µm range of static and dynamic systems at rates as high as 67 topographies per second, limited by the camera frame rate. The high speed of the technique and its ease of implementation could enable a paradigm shift in optical metrology, allowing the real-time characterisation of large or rapidly moving samples.

Suggested Citation

  • Narcís Vilar & Roger Artigas & Martí Duocastella & Guillem Carles, 2024. "Fast topographic optical imaging using encoded search focal scan," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46267-y
    DOI: 10.1038/s41467-024-46267-y
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    References listed on IDEAS

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    1. Liang Gao & Jinyang Liang & Chiye Li & Lihong V. Wang, 2014. "Single-shot compressed ultrafast photography at one hundred billion frames per second," Nature, Nature, vol. 516(7529), pages 74-77, December.
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