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Nano-lens diffraction around a single heated nano particle.

Markus Selmke1, Marco Braun, Frank Cichos

  • 1Leipzig University, Department for Experimental Physics I, Molecular Nanophotonics, 04103 Leipzig, Germany.

Optics Express
|March 29, 2012
PubMed
Summary

The lens-like action of a nanoscopic refractive index profile explains photothermal signals in microscopy. This study presents a diffraction model revealing this mechanism and its signal characteristics.

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Microscopy

Background:

  • Photothermal measurements utilize the interaction of light with matter to generate signals.
  • Nanoscopic refractive index profiles can act as phase-modifying elements, similar to lenses.
  • Previous electrodynamic treatments for photothermal single-nanoparticle microscopy were complex.

Purpose of the Study:

  • To elucidate the underlying mechanism of photothermal signals in single-nanoparticle microscopy.
  • To develop a simplified diffraction model for analyzing these signals.
  • To provide analytical expressions for signal characteristics.

Main Methods:

  • Developed a full ab-initio model based on diffraction theory.
  • Extended previous electrodynamic scattering treatments.

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  • Derived analytical expressions for photothermal signal shape, magnitude, and angular distribution.

    • Main Results:

    • Confirmed that the photothermal signal originates from a lens-like action of the induced refractive index profile.
    • The proposed model provides succinct analytical expressions for signal characteristics.
    • Demonstrated that the Gouy-phase does not influence the forward photothermal signal.

    Conclusions:

    • The lens-like action is the primary mechanism behind photothermal signals in single-nanoparticle microscopy.
    • The new diffraction model simplifies the analysis and prediction of photothermal signals.
    • This model aids in estimating signal shape and magnitude in photothermal single-particle microscopy.