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Polarization conversion-based molecular sensing using anisotropic plasmonic metasurfaces.

R Verre1, N Maccaferri2, K Fleischer3

  • 1Department of Physics, Chalmers University of Technology, 41296 Göteborg, Sweden. ruggero.verre@chalmers.se mikael.kall@chalmers.se.

Nanoscale
|May 7, 2016
PubMed
Summary
This summary is machine-generated.

We developed a self-referenced refractometric sensing method using anisotropic plasmonic metasurfaces. This novel approach measures biomolecular adsorption by detecting changes in light polarization, achieving high surface sensitivity.

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Area of Science:

  • Plasmonics and Nanophotonics
  • Optical Sensing Technologies
  • Biomolecular Detection

Background:

  • Anisotropic media alter light polarization.
  • Plasmonic nanoparticles offer high refractive index sensitivity.
  • Existing refractometric sensors may lack self-referencing capabilities.

Purpose of the Study:

  • To demonstrate self-referenced, single-wavelength refractometric sensing.
  • To leverage polarization conversion in anisotropic plasmonic metasurfaces for sensing.
  • To achieve sensitive detection of biomolecular adsorption.

Main Methods:

  • Fabrication of anisotropic plasmonic metasurfaces using gold dimers.
  • Experimental measurement of polarization rotation changes.
  • Utilizing biomolecular adsorption to induce refractive index changes.
  • Comparison of experimental results with analytical theory.

Main Results:

  • Demonstrated self-referenced refractometric sensing based on polarization conversion.
  • Achieved a surface sensitivity of 0.2 ng cm⁻² for biomolecular adsorption.
  • Confirmed the potential for miniaturized sensing applications.
  • Validated experimental findings with analytical theory.

Conclusions:

  • Anisotropic plasmonic metasurfaces enable sensitive, self-referenced refractometric sensing.
  • The demonstrated method offers a pathway for miniaturized and robust biosensing.
  • Further optimization can enhance sensitivity and expand applicability.