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Swept coded aperture real-time femtophotography.

Jingdan Liu1,2, Miguel Marquez1, Yingming Lai1

  • 1Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Université du Québec, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1P7, Canada.

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|February 21, 2024
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This study introduces swept coded aperture real-time femtophotography (SCARF), a new method for imaging ultrafast events in real-time. SCARF achieves high-speed, high-quality imaging without optoelectronic limitations, enabling new scientific discoveries.

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Area of Science:

  • Physics
  • Optics
  • Materials Science

Background:

  • Single-shot real-time femtophotography is crucial for capturing ultrafast dynamics.
  • Existing methods face limitations in speed, data quality, and acquisition accuracy.
  • Sensing model constraints limit the information obtainable with current techniques.

Purpose of the Study:

  • To overcome limitations of existing femtophotography techniques.
  • To develop a novel computational imaging modality for ultrafast dynamics.
  • To enable high-speed, high-accuracy imaging of transient phenomena.

Main Methods:

  • Developed swept coded aperture real-time femtophotography (SCARF).
  • Implemented all-optical ultrafast sweeping of a static coded aperture.
  • Achieved full-sequence encoding up to 156.3 THz per pixel on a CCD camera.

Main Results:

  • Demonstrated SCARF's single-shot ultrafast imaging capability.
  • Showcased tunable frame rates and spatial scales.
  • Successfully imaged ultrafast absorption in semiconductors and demagnetization in metal alloys in both reflection and transmission modes.

Conclusions:

  • SCARF overcomes previous limitations in speed and data quality for real-time femtophotography.
  • The technique offers broad applicability in studying ultrafast phenomena.
  • SCARF provides accurate acquisition of dynamic processes at the femtosecond scale.