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Label-free Single Molecule Detection Using Microtoroid Optical Resonators
08:53

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Published on: December 29, 2015

Label-free, single-molecule detection with optical microcavities.

Andrea M Armani1, Rajan P Kulkarni, Scott E Fraser

  • 1Department of Applied Physics, MC 128-95, California Institute of Technology, Pasadena, CA 91125, USA.

Science (New York, N.Y.)
|July 7, 2007
PubMed
Summary

This study introduces a novel optical sensor using a whispering-gallery microcavity for label-free, single-molecule detection. This highly sensitive technology enables precise identification of molecules without prior labeling.

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Area of Science:

  • Nanotechnology
  • Biotechnology
  • Optical Physics

Background:

  • Current single-molecule detection methods necessitate target molecule labeling.
  • Labeling can alter molecular properties and introduce experimental complexity.
  • A need exists for sensitive, label-free detection techniques.

Purpose of the Study:

  • To develop and demonstrate a highly specific and sensitive optical sensor for label-free, single-molecule detection.
  • To utilize a whispering-gallery microcavity for enhanced molecular sensing.
  • To validate the sensor's performance in detecting a specific biomolecule in a complex matrix.

Main Methods:

  • Fabrication of an ultrahigh quality (Q > 10^8) whispering-gallery microcavity.
  • Functionalization of the silica microcavity surface for target molecule binding.
  • Detection of binding events via resonant wavelength shifts caused by a thermo-optic mechanism.
  • Validation of single-molecule detection through observation of binding events and statistical analysis.

Main Results:

  • Demonstrated label-free, single-molecule detection of interleukin-2 in serum.
  • Achieved a dynamic concentration range of 10^12.
  • Confirmed single-molecule sensitivity by observing discrete resonant frequency shifts.
  • Established the whispering-gallery microcavity as a highly specific and sensitive detector.

Conclusions:

  • The developed whispering-gallery microcavity sensor offers a powerful platform for label-free, single-molecule detection.
  • The sensor exhibits high sensitivity, specificity, and a broad dynamic range.
  • This technology has significant potential for applications in diagnostics and molecular analysis.