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Scattering And Absorption of Light in Planetary Regoliths
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Resonances in electromagnetic scattering by objects with negative absorption.

M Kerker

    Applied Optics
    |March 9, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study numerically investigates electromagnetic scattering by circular cylinders with negative absorption. Sharp resonances were observed, leading to significant amplification of scattered and incident waves, even with negative extinction cross sections.

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    Area of Science:

    • Electromagnetic theory
    • Optical physics
    • Wave propagation

    Background:

    • Investigates electromagnetic scattering phenomena.
    • Focuses on particles with negative absorption properties.
    • Utilizes a homogeneous circular cylinder model.

    Purpose of the Study:

    • To numerically study electromagnetic scattering by homogeneous circular cylinders with negative absorption.
    • To evaluate scattering, amplification, and extinction cross sections.
    • To analyze the impact of negative absorption on wave amplification.

    Main Methods:

    • Numerical simulation of electromagnetic scattering.
    • Plane wave incidence perpendicular to the cylinder axis.
    • Evaluation of cross sections for varying size parameters (alpha) and refractive index (m = n(1 + kappai)).

    Main Results:

    • Observed sharp resonances in scattering and amplification.
    • Demonstrated significant amplification of scattered cylindrical waves.
    • Identified negative extinction cross sections leading to incident wave amplification.

    Conclusions:

    • Negative absorption in cylinders can lead to substantial wave amplification.
    • Resonances play a crucial role in enhancing scattering and amplification effects.
    • The study provides a framework for understanding amplification mechanisms in such systems.