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<p>Ultrafast pump-probe microscopy reveals spatial heterogeneity in material properties including charge and energy transfer, electron-phonon coupling, and vibrational dynamics. At high spatial resolution, weak nonlinear signals often require point scanning with significant signal averaging, limiting studies of non-repeatable processes or systems prone to photodamage from prolonged laser exposure. To overcome these limitations, we introduce a wide-field pump–probe approach that integrates Parallel Rapid Imaging with Spectroscopic Mapping (PRISM) and a self-referencing method, suppressing noise by more than two orders of magnitude. Our technique exploits spatial correlations within the field of view to denoise and suppress laser intensity fluctuations without a reference detector, enabling acquisition of over one million pump–probe traces in under a second. This capability supports high-throughput material screening, real-time ultrafast spectroscopy, and investigations of non-reversible dynamics. Applied to few-layer WSe₂ and monolayer WSe₂/MoSe₂ heterostructures, the method resolves vibrational modes and substrate-induced coupling previously hidden by laser noise.</p>

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Self-referencing ultrafast wide-field pump-probe microscopy

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月3日

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  • Rihan Wu,
  • Yaqing Zhang,
  • Md Shahjahan,
  • Elad Harel

摘要

Ultrafast pump-probe microscopy reveals spatial heterogeneity in material properties including charge and energy transfer, electron-phonon coupling, and vibrational dynamics. At high spatial resolution, weak nonlinear signals often require point scanning with significant signal averaging, limiting studies of non-repeatable processes or systems prone to photodamage from prolonged laser exposure. To overcome these limitations, we introduce a wide-field pump–probe approach that integrates Parallel Rapid Imaging with Spectroscopic Mapping (PRISM) and a self-referencing method, suppressing noise by more than two orders of magnitude. Our technique exploits spatial correlations within the field of view to denoise and suppress laser intensity fluctuations without a reference detector, enabling acquisition of over one million pump–probe traces in under a second. This capability supports high-throughput material screening, real-time ultrafast spectroscopy, and investigations of non-reversible dynamics. Applied to few-layer WSe₂ and monolayer WSe₂/MoSe₂ heterostructures, the method resolves vibrational modes and substrate-induced coupling previously hidden by laser noise.