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Asymmetry parameter and aggregate particles.

G Videen, R G Pinnick, D Ngo

    Applied Optics
    |February 13, 2008
    PubMed
    Summary
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    The scattering asymmetry parameter (g) for aggregate particles depends on interference and interaction effects. Interference dominates at short distances, while both effects diminish as particle separation increases.

    Area of Science:

    • Electromagnetic theory
    • Scattering phenomena
    • Nanoparticle interactions

    Background:

    • The scattering asymmetry parameter (g) is crucial for understanding light interaction with particles.
    • Aggregate particles exhibit complex scattering behaviors due to multiple components.

    Purpose of the Study:

    • To derive and analyze the general expression for the scattering asymmetry parameter (g) in aggregate particles.
    • To elucidate the contributions of interference and interaction effects to the overall scattering behavior.

    Main Methods:

    • Derivation of the general expression for the scattering asymmetry parameter (g).
    • Numerical analysis of two-sphere aggregates with varying separation distances.
    • Examination of electromagnetic field interference and interaction effects.

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    Main Results:

    • The asymmetry parameter (g) for aggregate particles comprises two distinct terms: interference and interaction.
    • Enhanced backscatter is a notable phenomenon arising from electromagnetic field interactions.
    • Interference effects are dominant when the separation distance is less than half the incident wavelength.
    • Both interference and interaction effects decrease significantly as particle separation increases.

    Conclusions:

    • The scattering asymmetry parameter (g) is a composite function of interference and interaction effects in aggregate particles.
    • Particle separation distance critically influences the dominance of these effects.
    • At large separations, the aggregate's asymmetry parameter converges to that of its individual constituents.