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Updated: Jan 23, 2026

Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy
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Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference

Anthony S Stender1

  • 1Department of Chemistry and Biochemistry, Ohio University; stender@ohio.edu.

Journal of Visualized Experiments : Jove
|June 25, 2019
PubMed
Summary

This protocol details preparing plasmonic nanoparticle samples for single-particle spectroscopy using differential interference contrast (DIC) microscopy. Careful sample preparation and microscope alignment ensure repeatable spectroscopy experiments for gold nanoparticles.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Differential interference contrast (DIC) microscopy is widely used for imaging microscale objects.
  • Single-particle spectroscopy requires precise sample preparation and imaging techniques.
  • Plasmonic nanoparticles exhibit unique optical properties crucial for various applications.

Purpose of the Study:

  • To provide a detailed protocol for preparing plasmonic nanoparticle samples for single-particle spectroscopy.
  • To demonstrate the application of DIC microscopy in conjunction with spectroscopy for nanoparticle analysis.
  • To establish a repeatable method for characterizing nanoparticle orientation and optical properties.

Main Methods:

  • Etching landmarks onto the substrate for sample navigation and tracking.
  • Thorough cleaning of the substrate to remove debris and contaminants.
  • Microscope optical path alignment using Kohler Illumination.
  • Sample rotation to optimize imaging of orientation-dependent optical properties.
  • Utilizing DIC microscopy's polarization fields to reveal nanoparticle orientation.
  • Careful data acquisition and analysis, including contrast and intensity data representation.

Main Results:

  • Successful preparation of plasmonic nanoparticle samples for spectroscopy.
  • Demonstration of repeatable spectroscopy experiments using DIC microscopy.
  • Characterization of spherical and rod-shaped gold nanoparticles.
  • Correlation of DIC contrast patterns with nanoparticle orientation.

Conclusions:

  • The presented protocol enables reliable single-particle spectroscopy of plasmonic nanoparticles using DIC microscopy.
  • DIC microscopy offers a valuable method for determining nanoparticle orientation based on optical properties.
  • This technique facilitates detailed characterization of nanoparticles for advanced research and applications.