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Indentation probe with optical fibre array-based optical coherence tomography for material deformation.

Marica Marrese1, E J Paardekam1, Davide Iannuzzi1

  • 1Department of Physics and Astronomy and LaserLab, Vrije Universiteit Amsterdam, The Netherlands.

Journal of Microscopy
|December 14, 2020
PubMed
Summary

This study introduces a novel optomechanical probe combining micro-indentation with optical coherence tomography (OCT) for soft matter analysis. The device visualizes material deformation in real-time, enabling precise mechanical characterization.

Keywords:
indentationlensed optical fibersoptical coherence tomographyoptical fiber array

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Area of Science:

  • Optomechanics
  • Soft Matter Physics
  • Biomedical Engineering

Background:

  • Mechanical testing of soft materials is crucial for understanding their properties.
  • Existing methods often lack simultaneous imaging capabilities, limiting detailed deformation analysis.
  • Optical coherence tomography (OCT) offers subsurface imaging but is typically separate from mechanical testing.

Purpose of the Study:

  • To develop and validate a novel optomechanical probe for simultaneous micro-indentation and OCT imaging.
  • To enable real-time visualization of soft matter deformation during mechanical testing.
  • To provide a tool for precise, non-invasive characterization of soft material mechanics.

Main Methods:

  • A micromachined cantilever with an indenting sphere was integrated with a 16-fibre array.
  • The fibre array was connected to a Common Path (CP)-OCT system for subsurface analysis.
  • Indentation tests were performed on a polydimethylsiloxane (PDMS) phantom to evaluate the probe's performance.

Main Results:

  • The integrated probe successfully performed micro-indentation on a PDMS phantom.
  • Real-time visualization of the phantom's subsurface deformation profile was achieved at various depths and locations.
  • Common Path (CP)-OCT combined with the micro-indentation sensor demonstrated effective subsurface analysis during indentation.

Conclusions:

  • The developed optomechanical probe effectively integrates micro-indentation with OCT imaging for soft matter characterization.
  • This hybrid approach allows for simultaneous mechanical testing and subsurface visualization of material deformation.
  • The technology holds promise for advanced, non-invasive characterization of soft material properties.