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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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...
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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 the...

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Related Experiment Video

Updated: Jun 6, 2026

Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
09:46

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

Published on: April 28, 2022

Ultrasensitive Chemical Detection Using Integrating Cavity-Enhanced Raman Spectroscopy.

Thomas Z Moore1,2, Joel N Bixler1, Brett H Hokr1

  • 1Texas A&M University, College Station, Texas 77843, United States.

Analytical Chemistry
|June 5, 2026
PubMed
Summary
This summary is machine-generated.

Researchers enhanced Raman spectroscopy sensitivity using a novel high-reflectivity integrating cavity. This breakthrough enables highly sensitive molecular detection for various applications.

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A Filter-based Surface Enhanced Raman Spectroscopic Assay for Rapid Detection of Chemical Contaminants
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A Filter-based Surface Enhanced Raman Spectroscopic Assay for Rapid Detection of Chemical Contaminants

Published on: February 19, 2016

Related Experiment Videos

Last Updated: Jun 6, 2026

Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
09:46

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

Published on: April 28, 2022

A Filter-based Surface Enhanced Raman Spectroscopic Assay for Rapid Detection of Chemical Contaminants
08:13

A Filter-based Surface Enhanced Raman Spectroscopic Assay for Rapid Detection of Chemical Contaminants

Published on: February 19, 2016

Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Raman spectroscopy is valuable for molecular analysis but limited by weak signal intensity.
  • Spontaneous Raman scattering is intrinsically weak, hindering broad applications.

Purpose of the Study:

  • To significantly enhance Raman signal intensity.
  • To develop a compact, high-sensitivity Raman spectroscopy system.

Main Methods:

  • Constructed a novel high-performance integrating cavity using Lambertian materials with high reflectivity.
  • Utilized cavity ringdown measurements to characterize cavity reflectivity (peak average 99.943 ± 0.0004% at 610 nm).
  • Performed Raman measurements on bulk methanol, magnesium sulfate, and glycine using a compact fiber-coupled laser.

Main Results:

  • Achieved μmol sensitivity for bulk analytes with a compact 405 nm laser (17 mW).
  • Demonstrated nanomole-level sensitivity for polycyclic aromatic hydrocarbons (benzo[a]pyrene, pyrene) using a 532 nm laser (150 mW).
  • Confirmed exceptionally high reflectivity of the novel integrating cavity materials.

Conclusions:

  • Integrating cavity-enhanced Raman spectroscopy (ICERS) offers a promising path for sensitive molecular detection.
  • The developed system is compact and suitable for diverse applications including medical, environmental, and industrial fields.
  • High reflectivity of novel Lambertian materials is key to achieving significant Raman signal enhancement.