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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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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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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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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Related Experiment Video

Updated: Jul 1, 2025

Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
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Transient stimulated Raman scattering spectroscopy and imaging.

Qiaozhi Yu1, Zhengjian Yao1, Jiaqi Zhou1

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

Light, Science & Applications
|March 7, 2024
PubMed
Summary

Transient stimulated Raman scattering (T-SRS) offers a new time-domain approach for chemical imaging, overcoming limitations of frequency-domain methods. This technique achieves natural linewidth spectral resolution and enhanced sensitivity for advanced applications.

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Area of Science:

  • Chemical Imaging
  • Spectroscopy
  • Quantum Coherence

Background:

  • Stimulated Raman scattering (SRS) is a key quantitative chemical imaging technique.
  • Current SRS methods suffer from spectral broadening, limiting resolution and sensitivity.
  • Existing SRS techniques face trade-offs between spectral resolution, range, and acquisition speed.

Purpose of the Study:

  • To introduce transient stimulated Raman scattering (T-SRS) as a novel time-domain strategy.
  • To overcome fundamental limitations of frequency-domain SRS imaging.
  • To achieve natural linewidth spectral resolution and enhanced sensitivity in SRS.

Main Methods:

  • Utilizing quantum coherence manipulation and femtosecond pulse-pair sequences.
  • Encoding vibrational oscillations in the stimulated Raman loss (SRL) signal.
  • Acquiring time-domain SRL signals and performing Fourier transforms for spectral analysis.

Main Results:

  • T-SRS achieves natural-linewidth-limit spectral line shapes and laser-bandwidth-determined spectral range.
  • Sensitivity is boosted to the sub-millimolar (sub-mM) level for typical Raman modes using ~150-fs laser pulses.
  • Demonstrated hyperspectral SRS imaging of live-cell metabolism and high-density multiplexed imaging with high spectral resolution.

Conclusions:

  • T-SRS provides a breakthrough in SRS imaging by bypassing traditional conjugations between sensitivity, spectral resolution, range, and speed.
  • The technique enables high-fidelity spectral data acquisition, crucial for detailed chemical analysis.
  • T-SRS holds significant potential for diverse advanced Raman imaging applications, including live-cell analysis.