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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
Published on: July 25, 2022
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Super-resolution vibrational microscopy by stimulated Raman excited fluorescence
Hanqing Xiong1, Naixin Qian1, Yupeng Miao1
1Department of Chemistry, Columbia University, New York, NY, 10027, USA.
Light, Science & Applications
|April 21, 2021
Summary
Researchers developed a new super-resolution vibrational imaging technique using Stimulated Raman Excited Fluorescence (SREF). This method overcomes sensitivity limitations, achieving enhanced resolution in biological samples with mild laser power.
Area of Science:
- Optics and Photonics
- Chemical Imaging
- Microscopy
Background:
- Super-resolution Raman imaging offers high chemical specificity but faces sensitivity challenges.
- Existing methods struggle with biocompatible, far-field super-resolution vibrational imaging.
- Stimulated Raman Excited Fluorescence (SREF) combines Raman specificity with fluorescence sensitivity.
Purpose of the Study:
- To develop a novel super-resolution vibrational imaging method utilizing SREF.
- To overcome background noise and achieve high-contrast SREF imaging.
- To enable multicolor super-resolution vibrational imaging with nanometer spectral resolution.
Main Methods:
- Harnessing SREF as the contrast mechanism for super-resolution imaging.
- Implementing a frequency-modulation (FM) strategy to eliminate broadband backgrounds.
- Integrating stimulated emission depletion (STED) with background-free FM-SREF.
- Utilizing newly synthesized SREF dyes for multicolor imaging.
Main Results:
- Achieved high-contrast SREF imaging by removing anti-Stokes fluorescence background.
- Demonstrated multicolor FM-SREF imaging with nanometer spectral resolution.
- Developed STED-FM-SREF microscopy for high-contrast super-resolution vibrational imaging.
- Obtained over two-fold resolution improvement in biological systems using moderate laser power.
Conclusions:
- STED-FM-SREF microscopy offers a promising approach for super-resolution vibrational imaging.
- The technique provides high sensitivity, vibrational contrast, and requires mild laser excitation.
- This method is envisioned to significantly advance various biological and chemical imaging applications.
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