Journal
OPTICS EXPRESS
Volume 17, Issue 25, Pages 23114-23122Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.023114
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Funding
- National Institute of Health [NIBIB, R21 EB005321, NIBIB, R01 EB009073]
- National Science Foundation [BES 05-19920]
- Linda Su-Nan Chang Sah Doctoral Fellowship through the Department of Electrical and Computer Engineering
- University of Illinois at Urbana-Champaign
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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. (C) 2009 Optical Society of America
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