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Related Experiment Video

Updated: Jun 3, 2026

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

High sensitivity nanoparticle detection using optical microcavities.

Tao Lu1, Hansuek Lee, Tong Chen

  • 1Department of Applied Physics, MC 128-95, California Institute of Technology, Pasadena, CA 91125, USA. taolu@ece.uvic.ca

Proceedings of the National Academy of Sciences of the United States of America
|March 30, 2011
PubMed
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This study presents a novel nanoparticle and virus detection method achieving record sensitivity down to 12.5 nm. The technique significantly enhances the signal-to-noise ratio for detecting viruses like Influenza A.

Area of Science:

  • Nanotechnology
  • Biophysics
  • Optical Physics

Background:

  • Accurate detection of nanoparticles and viruses is crucial for diagnostics and research.
  • Existing methods often lack the sensitivity to detect nanoscale biological entities like single protein molecules.

Purpose of the Study:

  • To develop a highly sensitive method for detecting nanoparticles and viruses.
  • To achieve detection sensitivity approaching the size of single protein molecules.
  • To improve the signal-to-noise ratio for virus detection.

Main Methods:

  • Utilized a thermal-stabilized reference interferometer.
  • Employed an ultrahigh-Q microcavity.
  • Measured wavelength shifts caused by nanoparticle binding without feedback stabilization.

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Related Experiment Videos

Last Updated: Jun 3, 2026

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Optical Trapping of Nanoparticles
13:39

Optical Trapping of Nanoparticles

Published on: January 15, 2013

Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment
09:13

Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment

Published on: April 4, 2017

Main Results:

  • Achieved detection of nanobeads down to a record radius of 12.5 nm.
  • Demonstrated inference of particle size from wavelength shift maxima.
  • Enhanced the signal-to-noise ratio for Influenza A virus detection from 31 to 381.
  • Identified particle-induced backscatter and optical-path shifts as enhancers for detection.

Conclusions:

  • The developed method offers unprecedented sensitivity for nanoscale detection.
  • This technique has potential applications in early disease detection and molecular analysis.
  • The combination of interferometer and microcavity provides a robust platform for high-sensitivity sensing.