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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Published on: December 30, 2025

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Saturated Raman scattering for sub-diffraction-limited imaging.

T Würthwein1, N Irwin1, C Fallnich1

  • 1Institute of Applied Physics, University of Münster, Münster, Germany.

The Journal of Chemical Physics
|November 24, 2019
PubMed
Summary
This summary is machine-generated.

We developed a new Raman microscope achieving sub-diffraction-limited resolution. This advanced technique suppresses Raman signals, enabling label-free imaging with twice the normal resolution.

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Area of Science:

  • Optical Microscopy
  • Spectroscopy
  • Nanotechnology

Background:

  • Diffraction limits conventional optical microscopes, restricting resolution.
  • Raman microscopy offers label-free chemical contrast but is diffraction-limited.
  • Stimulated depletion microscopy and femtosecond stimulated Raman scattering are advanced optical techniques.

Purpose of the Study:

  • To propose and demonstrate a scheme for a sub-diffraction-limited Raman microscope.
  • To achieve enhanced resolution in label-free chemical imaging.
  • To combine stimulated depletion microscopy concepts with femtosecond stimulated Raman scattering.

Main Methods:

  • A three-beam setup utilizing two wavelength components was employed.
  • Raman scattering saturation was used to suppress the Raman signal.
  • Femtosecond stimulated Raman scattering (FSRS) was integrated into the scheme.

Main Results:

  • A significant reduction in the Raman signal, up to 79%, was achieved with a single Raman resonance.
  • Resolution enhancement by a factor of 2 was experimentally verified in a proof-of-concept measurement.
  • The method demonstrates the feasibility of overcoming diffraction limits in Raman microscopy.

Conclusions:

  • The proposed scheme successfully enables sub-diffraction-limited Raman microscopy.
  • Signal suppression via Raman saturation is a viable strategy for resolution enhancement.
  • This work paves the way for advanced label-free sub-diffraction-limited imaging applications.