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Measuring nanoparticle size using optical surface profilers.

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  • 1MQ Photonics Research Centre, Department of Physics and Astronomy, Macquarie University, North Ryde, NSW2109, Australia. douglas.little@mq.edu.au

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Summary
This summary is machine-generated.

This study introduces a wave-optics model to correct diffraction artifacts in optical surface profilers, enabling accurate nanoparticle size measurements. The method successfully measures nanospheres and nano-cylinders down to 12 nm and 10-15 nm radii, respectively.

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Area of Science:

  • Metrology
  • Nanotechnology
  • Wave Optics

Background:

  • Optical surface profilers are advanced tools for surface height measurements.
  • Diffraction artifacts conventionally limit their application in nanoparticle analysis.
  • Accurate nanoparticle sizing is crucial for various scientific and industrial applications.

Purpose of the Study:

  • To develop a theoretical wave-optics model to correct diffraction artifacts in optical surface profilers.
  • To enable accurate measurement of nanoparticle dimensions using these instruments.
  • To validate the model for both phase shifting interferometry and vertical scanning interferometry.

Main Methods:

  • Development of a theoretical model based on wave-optics principles.
  • Application of the model to analyze data from optical surface profilers.
  • Experimental validation using phase shifting interferometry and vertical scanning interferometry.

Main Results:

  • The wave-optics model effectively accounts for diffraction artifacts in optical surface profilers.
  • Accurate measurement of nanoparticle sizes with known geometries is achieved.
  • Demonstrated measurement of nanosphere radii as small as 12 nm.
  • Demonstrated measurement of nano-cylinder radii as small as 10-15 nm.

Conclusions:

  • A novel wave-optics approach enables accurate nanoparticle sizing with optical surface profilers.
  • This method overcomes limitations posed by diffraction artifacts.
  • The technique is applicable to phase shifting and vertical scanning interferometry, extending nanoparticle metrology capabilities.