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Biosensing with a scanning planar Yagi-Uda antenna.

Navid Soltani1,2, Elham Rabbany Esfahany1,2, Sergey I Druzhinin2,3

  • 1Laboratory of Nano-Optics, University of Siegen, Siegen 57072, Germany.

Biomedical Optics Express
|March 14, 2022
PubMed
Summary

This study demonstrates a novel Yagi-Uda antenna for enhanced fluorescence detection of DNA molecules labeled with ATTO-647N dye. The antenna improves collection efficiency, enabling sensitive detection of even single DNA molecules.

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Spectroscopy

Background:

  • Fluorescence microscopy is crucial for biological studies.
  • Improving the sensitivity and efficiency of fluorescence detection remains a key challenge.
  • Planar antennas offer potential for enhancing light-matter interactions.

Purpose of the Study:

  • To investigate the use of a z-scanning planar Yagi-Uda antenna for enhancing fluorescence collection.
  • To evaluate the antenna's performance in detecting DNA molecules labeled with ATTO-647N dye.
  • To demonstrate a versatile method for sensitive biomolecule detection.

Main Methods:

  • Utilized a z-scanning planar Yagi-Uda antenna in a liquid environment.
  • Conjugated ATTO-647N dye to deoxyribonucleic acid (DNA) molecules.
  • Measured changes in excitation and decay rates, and emission patterns of the dye.

Main Results:

  • The antenna significantly narrowed the emission angle of ATTO-647N to 41°.
  • Achieved improved fluorescence collection efficiency.
  • Successfully detected immobilized DNA molecules down to 1 nM concentration, corresponding to fewer than 10 molecules.

Conclusions:

  • The Yagi-Uda antenna enhances fluorescence detection sensitivity for dye-labeled biomolecules.
  • The method is effective for detecting low concentrations of DNA.
  • The technique is versatile and applicable to various dye-labeled biomolecules in different environments.