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Synthesis of Immunotargeted Magneto-plasmonic Nanoclusters
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Circular magnetoplasmonic modes in gold nanoparticles.

Francesco Pineider1, Giulio Campo, Valentina Bonanni

  • 1Department of Chemistry, University of Florence & INSTM , 50019 Florence, Italy.

Nano Letters
|September 21, 2013
PubMed
Summary

Researchers observed magnetoplasmonic modes in gold nanoparticles using magnetic circular dichroism. This finding offers a highly sensitive method for magnetoplasmonic refractometric sensing, detecting changes in surrounding refractive index.

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Area of Science:

  • Plasmonics
  • Nanotechnology
  • Magnetism

Background:

  • Modulating localized surface plasmon resonance (LSPR) is crucial for active plasmonics.
  • Magnetic field modulation is a promising approach for LSPR control.

Purpose of the Study:

  • To observe and model magnetoplasmonic modes in colloidal gold nanoparticles.
  • To demonstrate the potential of these modes for sensitive refractive index sensing.

Main Methods:

  • Utilized magnetic circular dichroism (MCD) spectroscopy to detect magnetoplasmonic modes.
  • Developed a theoretical model to accurately reproduce experimental observations.

Main Results:

  • Successfully observed magnetoplasmonic modes in colloidal gold nanoparticles.
  • The developed model showed high qualitative and quantitative accuracy in reproducing experimental data.
  • Identified a steep slope at plasmon resonance in the MCD spectrum.

Conclusions:

  • The observed magnetoplasmonic modes are highly sensitive to changes in the surrounding medium's refractive index.
  • Demonstrated proof of principle for magnetoplasmonic refractometric sensing applications.