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Updated: Jun 25, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Temperature mapping near plasmonic nanostructures using fluorescence polarization anisotropy.

G Baffou1, M P Kreuzer, F Kulzer

  • 1ICFO - Institut de Ciencies Fotoniques, 08860 Castelldefels (Barcelona), Spain. guillaume.baffou@icfo.es

Optics Express
|March 5, 2009
PubMed
Summary

A new thermal imaging technique uses fluorescence polarization anisotropy to map temperatures near nanoscale heat sources with high resolution and accuracy. This method offers improved insights for applications in medicine and nanoelectronics.

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Area of Science:

  • Nanoscale thermal imaging
  • Optical thermometry
  • Fluorescence spectroscopy

Background:

  • Accurate temperature mapping at the nanoscale is crucial for understanding and controlling processes in fields like nanoelectronics and medicine.
  • Existing thermal imaging techniques face limitations in spatial resolution and accuracy when probing nanometer-sized heat sources.

Purpose of the Study:

  • To introduce and demonstrate a novel thermal imaging technique based on fluorescence polarization anisotropy.
  • To achieve high spatial resolution (300 nm) and accuracy (0.1°C) in mapping local temperatures near nanoscale heat sources.

Main Methods:

  • Utilizing fluorescence polarization anisotropy measurements to probe molecular Brownian dynamics.
  • Applying the technique to map the temperature distribution around plasmonic nanostructures heated by near-infrared light.

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Last Updated: Jun 25, 2026

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Main Results:

  • Successfully mapped the temperature landscape around plasmonic nanostructures with 300 nm spatial resolution and 0.1°C accuracy.
  • Demonstrated that fluorescence polarization anisotropy is a robust method for thermal imaging, overcoming limitations of prior techniques.

Conclusions:

  • Fluorescence polarization anisotropy provides a reliable and high-resolution method for nanoscale thermal imaging.
  • This technique opens new avenues for precise temperature control in medicine, nanoelectronics, and nanofluidics.