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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 25 — Dec. 7, 2009
  • pp: 23114–23122

Magnetomotive nanoparticle transducers for optical rheology of viscoelastic materials

Vasilica Crecea, Amy L. Oldenburg, Xing Liang, Tyler S. Ralston, and Stephen A. Boppart  »View Author Affiliations

Optics Express, Vol. 17, Issue 25, pp. 23114-23122 (2009)

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The availability of a real-time non-destructive modality to interrogate the mechanical properties of viscoelastic materials would facilitate many new investigations. We introduce a new optical method for measuring elastic properties of samples which employs magnetite nanoparticles as perturbative agents. Magnetic nanoparticles distributed in silicone-based samples are displaced upon probing with a small external magnetic field gradient and depth-resolved optical coherence phase shifts allow for the tracking of scatterers in the sample with nanometer-scale sensitivity. The scatterers undergo underdamped oscillations when the magnetic field is applied step-wise, allowing for the measurement of the natural frequencies of oscillation of the samples. Validation of the measurements is accomplished using a commercial indentation apparatus to determine the elastic moduli of the samples. This real-time non-destructive technique constitutes a novel way of probing the natural frequencies of viscoelastic materials in which magnetic nanoparticles can be introduced.

© 2009 OSA

OCIS Codes
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(160.3820) Materials : Magneto-optical materials
(170.4500) Medical optics and biotechnology : Optical coherence tomography

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: October 11, 2009
Revised Manuscript: November 18, 2009
Manuscript Accepted: December 1, 2009
Published: December 2, 2009

Vasilica Crecea, Amy L. Oldenburg, Xing Liang, Tyler S. Ralston, and Stephen A. Boppart, "Magnetomotive nanoparticle transducers for optical rheology of viscoelastic materials," Opt. Express 17, 23114-23122 (2009)

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