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Self-referencing ultrafast wide-field pump-probe microscopy
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Self-referencing ultrafast wide-field pump-probe microscopy
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Self-referencing ultrafast wide-field pump-probe microscopy
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Journal Article
Self-referencing ultrafast wide-field pump-probe microscopy
2025
Overview
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.
A wide-field pump–probe microscopy method captures over a million ultrafast traces per second with reduced noise and no reference detector, revealing hidden vibrational modes and couplings in 2D materials and heterostructure.
