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Interferometric system for precise submicrometer particle sizing.

A Bassini, M Menchise, S Musazzi

    Applied Optics
    |February 12, 2008
    PubMed
    Summary
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    This study introduces an interferometric system for submicrometer particle sizing. However, it found that particle size detection is ambiguous for particles larger than 0.5 micrometers due to phase plot limitations.

    Area of Science:

    • Optical Physics
    • Nanotechnology
    • Particle Characterization

    Background:

    • Interferometric techniques are crucial for precise measurements in science.
    • Previous research focused on submicrometer particle sizing using interferometry.
    • Extending these methods to larger particles presents unique challenges.

    Purpose of the Study:

    • To develop and evaluate an interferometric system for particle sizing.
    • To investigate the feasibility of sizing particles larger than 0.5 micrometers.
    • To compare experimental results with theoretical predictions for polystyrene spheres.

    Main Methods:

    • Utilized a Mach-Zehnder-type interferometer with a heterodyne detection scheme.
    • Measured the phase of the optical field resulting from wave interference.

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  • Employed polystyrene spheres with diameters ranging from 0.16 to 0.71 micrometers.

    • Main Results:

    • The developed system successfully measured particle sizes within the submicrometer range.
    • A limitation was observed for particles larger than 0.5 micrometers.
    • The phase versus particle-size plot showed a maximum around 0.5 micrometer diameters, preventing unambiguous size determination.

    Conclusions:

    • The interferometric system is effective for submicrometer particle sizing.
    • The technique faces limitations in univocal particle size detection for diameters near and above 0.5 micrometers.
    • Further refinement is needed to overcome ambiguities in larger particle size measurement.