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Related Experiment Video

Updated: Jul 13, 2026

Single-Molecule Surface-Enhanced Raman Scattering Measurements Enabled by Plasmonic DNA Origami Nanoantennas
10:43

Single-Molecule Surface-Enhanced Raman Scattering Measurements Enabled by Plasmonic DNA Origami Nanoantennas

Published on: July 21, 2023

Nanoparticle-enhanced diffraction gratings for ultrasensitive surface plasmon biosensing.

Alastair W Wark1, Hye Jin Lee, Abraham J Qavi

  • 1Department of Chemistry, University of California Irvine, Irvine, CA 92697, USA.

Analytical Chemistry
|August 7, 2007
PubMed
Summary

Researchers developed ultrasensitive surface bioaffinity sensors using gold nanoparticles on gratings. This novel biosensor technology achieves enhanced diffraction for detecting DNA at extremely low concentrations, paving the way for advanced diagnostics.

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Area of Science:

  • Nanotechnology
  • Biosensing
  • Surface Plasmon Resonance

Background:

  • Surface bioaffinity sensors are crucial for detecting biological molecules.
  • Existing sensors often face limitations in sensitivity and detection limits.
  • Gold nanoparticles offer unique optical properties for enhanced sensing applications.

Purpose of the Study:

  • To create ultrasensitive surface bioaffinity sensors.
  • To investigate the optical coupling between gold nanoparticles and gold diffraction gratings.
  • To demonstrate the sensor's capability in detecting unmodified DNA.

Main Methods:

  • Adsorption of gold nanoparticles onto gold diffraction gratings.
  • Utilizing a surface plasmon resonance (SPR) geometry.

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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

Published on: September 27, 2011

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Last Updated: Jul 13, 2026

Single-Molecule Surface-Enhanced Raman Scattering Measurements Enabled by Plasmonic DNA Origami Nanoantennas
10:43

Single-Molecule Surface-Enhanced Raman Scattering Measurements Enabled by Plasmonic DNA Origami Nanoantennas

Published on: July 21, 2023

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
09:29

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

Published on: September 27, 2011

  • Measuring enhanced diffraction due to coupled surface plasmons.

    • Main Results:

    • Successfully created nanoparticle grating biosensors.
    • Observed enhanced diffraction through optical coupling of planar and localized surface plasmons.
    • Demonstrated detection of unmodified DNA at a concentration of 10 femtomolar (fM).

    Conclusions:

    • The developed nanoparticle grating biosensors exhibit ultrasensitive detection capabilities.
    • Optical coupling significantly enhances sensor performance.
    • This technology shows promise for highly sensitive biomolecule detection, including DNA.