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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Updated: Aug 4, 2025

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
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Transient Stimulated Raman Excited Fluorescence Spectroscopy.

Qiaozhi Yu1, Zhengjian Yao1, Haolin Zhang2,3

  • 1National Biomedical Imaging Center, College of Future Technology, Peking University, Beijing 100871, China.

Journal of the American Chemical Society
|March 30, 2023
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Summary

Transient stimulated Raman excited fluorescence (T-SREF) achieves background-free, single-molecule Raman spectra. This ultrafast time-domain spectroscopy method enhances sensitivity for advanced molecular analysis.

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Area of Science:

  • Optics and Spectroscopy
  • Chemical Physics
  • Molecular Spectroscopy

Background:

  • Raman spectroscopy aims for enhanced sensitivity, crucial for molecular analysis.
  • Current single-molecule Raman spectroscopy methods face challenges with fluorescence backgrounds and excitation.
  • Existing frequency-domain techniques lack efficient hyperspectral excitation.

Purpose of the Study:

  • To develop an ultrafast time-domain spectroscopy method for background-free Raman spectra.
  • To overcome limitations of existing frequency-domain Raman spectroscopy.
  • To achieve high sensitivity for molecular detection and dynamics sensing.

Main Methods:

  • Introduced transient stimulated Raman excited fluorescence (T-SREF), an ultrafast time-domain technique.
  • Utilized two successive broadband femtosecond pulse pairs (pump and Stokes pulses) with time-delay scanning.
  • Applied Fourier transform to time-domain fluorescence traces revealing vibrational wave packet interference.

Main Results:

  • T-SREF successfully generated background-free Raman spectra of electronic-coupled vibrational modes.
  • Achieved sensitivity at the level of a few molecules.
  • Demonstrated vibrational wave packet interference in time-domain fluorescence.

Conclusions:

  • T-SREF offers a powerful alternative to frequency-domain Raman spectroscopy.
  • The method enables supermultiplexed fluorescence detection and molecular dynamics sensing.
  • T-SREF significantly advances the sensitivity and applicability of Raman spectroscopy.