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All-optical adaptive scanning acoustic microscope.

Steve D Sharples1, Matt Clark, Mike G Somekh

  • 1School of Electrical and Electronic Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, UK. steve.sharples@nottingham.ac.uk

Ultrasonics
|June 5, 2003
PubMed
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We developed a laser-based surface acoustic wave (SAW) microscope for rapid, high-resolution imaging without sample damage. This advanced acoustic microscopy system compensates for material properties, enabling real-time adjustments for imaging anisotropic materials.

Area of Science:

  • Acoustic Microscopy
  • Optical Physics
  • Materials Science

Background:

  • Traditional scanning acoustic microscopes can be damaging to samples.
  • Laser-based acoustic microscopy offers a non-perturbing alternative.
  • Controlling acoustic wave generation is crucial for high-resolution imaging.

Purpose of the Study:

  • To develop a fast, non-perturbing laser-based surface acoustic wave (SAW) microscope.
  • To enable high-resolution vector contrast imaging with quantitative amplitude and phase measurements.
  • To address challenges in material property dependence and enable imaging of anisotropic materials.

Main Methods:

  • Construction of a laser-based SAW microscope utilizing computer-generated holograms.
  • Employing a spatial light modulator to adapt optical generation profiles.

Related Experiment Videos

  • Integration with an acoustic wavefront sensor for real-time adjustments.

    • Main Results:

    • Achieved rapid, high-resolution vector contrast imaging without sample damage.
    • Demonstrated compensation for material properties like SAW velocity and anisotropy.
    • Facilitated simpler alignment and velocity matching through adaptive optical generation.

    Conclusions:

    • The developed laser-based SAW microscope provides a non-perturbing method for quantitative acoustic imaging.
    • Adaptive optical generation using spatial light modulators enhances imaging capabilities, especially for anisotropic materials.
    • Future integration with acoustic wavefront sensing will enable real-time imaging adjustments.