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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

584
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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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

529
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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Related Experiment Video

Updated: Sep 5, 2025

Author Spotlight: Single-Molecule Surface-Enhanced Raman Scattering Measurements Enabled by Plasmonic DNA Origami Nanoantennas
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Metasurface-Enhanced Raman Spectroscopy (mSERS) for Oriented Molecular Sensing.

Yuan Zeng1,2, Riddhi Ananth3, Tyler J Dill1

  • 1Department of NanoEngineering, University of California, San Diego, 9500 Gilman Drive MC 0448, La Jolla, California 92093-0448, United States.

ACS Applied Materials & Interfaces
|July 11, 2022
PubMed
Summary

A new metasurface-enhanced Raman spectroscopy (mSERS) platform enables ultrasensitive detection of oriented molecules. This advanced SERS sensor offers high sensitivity for chemical sensing and environmental analysis.

Keywords:
SERSchemical sensingcolloidsmetasurfaceplasmonic

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Area of Science:

  • Plasmonics
  • Nanotechnology
  • Spectroscopy

Background:

  • Surface-enhanced Raman spectroscopy (SERS) offers ultrasensitive chemical detection.
  • Plasmonic nanogaps enhance SERS signals but are sensitive to molecular orientation.
  • Nanoparticle aggregation often leads to signal instability in colloidal SERS platforms.

Purpose of the Study:

  • To develop a nanoparticle-on-metal metasurface platform for enhanced Raman detection of highly oriented molecular analytes.
  • To overcome challenges of nanoparticle aggregation and signal fluctuation in SERS.
  • To demonstrate a metasurface-enhanced Raman spectroscopy (mSERS) platform for quantitative molecular detection.

Main Methods:

  • Fabrication of a nanoparticle-on-metal metasurface using colloidal Langmuir-Schaefer deposition.
  • Design for near-perfect optical absorption and high surface coverage of nanogaps.
  • Integration of local electric field simulations and experimental characterization of mSERS signals.

Main Results:

  • Achieved up to 32% surface coverage density of nanogaps.
  • Demonstrated quantitative detection of polybrominated diphenyl ether (BDE-15) at 0.25 μM.
  • mSERS platform showed comparable detection limits to other SERS sensors at significantly lower laser power.

Conclusions:

  • The developed mSERS platform effectively detects highly oriented molecular analytes.
  • This platform overcomes aggregation issues, providing stable and sensitive Raman signals.
  • mSERS shows significant promise for nondestructive, low-level analyte detection in various applications.