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Strain mapping with optically coupled plasmonic particles embedded in a flexible substrate.

Takumi Sannomiya1, Christian Hafner, Janos Vörös

  • 1Department of Information Technology and Engineering, ETH Zürich, Zürich, Switzerland. sannomiya@biomed.ee.ethz.ch

Optics Letters
|July 3, 2009
PubMed
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Stretching an elastomer embedded with gold nanoparticles changes their optical coupling. This optical shift, dependent on polarization, was confirmed by simulations and used to map material strain.

Area of Science:

  • Plasmonics
  • Materials Science
  • Optical Physics

Background:

  • Plasmonic nanoparticles exhibit unique optical properties due to surface plasmon resonance.
  • The optical coupling between nanoparticles is sensitive to their interparticle distance and arrangement.
  • Elastomeric materials offer tunable mechanical properties for embedding nanoparticles.

Purpose of the Study:

  • To investigate the effect of elastomer deformation on the optical coupling of embedded gold nanoparticles.
  • To correlate changes in optical properties with induced interparticle distance variations.
  • To develop a method for strain mapping using optical responses of plasmonic composites.

Main Methods:

  • Embedding 50 nm gold nanoparticles within a matrix elastomer.

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  • Applying mechanical strain to the elastomer and observing changes in optical properties.
  • Utilizing polarized light microscopy to analyze optical coupling.
  • Performing multiple multipole program simulations to model spectral changes.
  • Constructing strain vector maps from microscopy images.

    • Main Results:

    • Observed changes in optical coupling of plasmonic particles upon elastomer deformation.
    • Higher optical extinction was detected at polarization perpendicular to the strain direction compared to parallel.
    • Simulations confirmed that deformation-induced changes in particle cluster orientation alter the spectral response.
    • Strain vector maps were successfully constructed using polarization-dependent microscopy at a strain-sensitive wavelength.

    Conclusions:

    • Elastomer deformation significantly alters the optical coupling of embedded plasmonic nanoparticles.
    • Polarization-dependent optical extinction serves as a sensitive indicator of interparticle distance changes.
    • Simulations validate the observed optical phenomena and the role of particle cluster orientation.
    • This work demonstrates a novel approach for visualizing and quantifying strain in materials using plasmonic nanoparticle responses.