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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

797
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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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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Optical Trapping of Plasmonic Nanoparticles for In Situ Surface-Enhanced Raman Spectroscopy Characterizations
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Plasmonic Electronic Raman Scattering as Internal Standard for Spatial and Temporal Calibration in Quantitative

Wonil Nam1, Yuming Zhao1, Junyeob Song1,2

  • 1Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States.

The Journal of Physical Chemistry Letters
|October 29, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces electronic Raman scattering (ERS) from metal as a novel internal standard for calibrating ultrasensitive surface-enhanced Raman spectroscopy (SERS) measurements. This method overcomes limitations of traditional Raman tags for accurate quantitative analysis.

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Area of Science:

  • Nanophotonics
  • Spectroscopy
  • Materials Science

Background:

  • Ultrasensitive surface-enhanced Raman spectroscopy (SERS) struggles with quantitative analysis due to optical field variations at plasmonic hotspots.
  • Existing calibration methods using Raman tags are limited by analyte competition, spectral interference, and photodegradation.

Purpose of the Study:

  • To develop a robust internal standard for quantitative SERS analysis.
  • To address limitations of current calibration approaches in SERS.

Main Methods:

  • Utilizing plasmon-enhanced electronic Raman scattering (ERS) signals from metal as an internal standard.
  • Calibrating molecular Raman scattering (MRS) signals from analyte molecules at the same hotspots.
  • Investigating the linear dependence between ERS and MRS signal intensities under varying optical fields.

Main Results:

  • ERS signals serve as a reliable internal standard for spatial and temporal calibration of MRS signals.
  • Observed linear dependence between ERS and MRS intensities, consistent with |E|^4 enhancement theory.
  • Identified analyte molecule orientation at hotspots as a potential performance limit for ERS calibration.

Conclusions:

  • Plasmon-enhanced ERS is a viable internal standard for rigorous quantitative SERS analysis.
  • The ERS calibration method overcomes key limitations of traditional SERS calibration techniques.
  • Analyte orientation effects warrant further investigation for optimizing SERS quantification.