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Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging

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Multiorder Stimulated Raman Scattering in Colliding Droplets.

Kosuke Negishi¹, Shuhei Suzuki¹, Jun-Ya Kohno¹

¹Department of Chemistry , Faculty of Science, Gakushuin University , 1-5-1 Mejiro , Toshima-ku, Tokyo 171-8588 , Japan.

The Journal of Physical Chemistry. A

|July 19, 2018

Summary

Colliding liquid droplets create a novel optical cavity, significantly enhancing Raman scattering intensity for sensitive molecular analysis. This breakthrough improves Raman spectroscopy for liquids.

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Area of Science:

Optics
Spectroscopy
Physical Chemistry

Background:

Nonlinear Raman spectroscopy enhances Raman scattering intensity.
Intense light fields are required, often provided by optical cavities.
Liquid droplets can serve as high-quality optical cavities.

Purpose of the Study:

To introduce colliding droplets as a novel optical cavity for Raman spectroscopy.
To investigate the enhancement of Raman scattering intensity using this new method.
To analyze the generated Raman bands and compare with theoretical predictions.

Main Methods:

Utilizing colliding liquid droplets as a novel optical cavity.
Generating multiorder stimulated Raman-scattered light from carbon tetrachloride (CCl4) droplets.
Analyzing Raman band intensities with a simple theoretical model.

Main Results:

Significant enhancement in the intensity of multiorder stimulated Raman-scattered light was observed.
The experimental Raman spectrum from colliding droplets was roughly reproduced by the theory.
The colliding droplet method demonstrated high sensitivity and resolution for liquid samples.

Conclusions:

Colliding droplets offer a new and effective optical cavity for enhancing Raman spectroscopy.
This technique facilitates sensitive and high-resolution spectroscopic analysis of molecules in liquids.
The findings pave the way for advanced applications of Raman spectroscopy.