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Related Experiment Video

Updated: Mar 3, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

The partial light scattering cross section of spherical particles.

Christopher M Sorensen, Justin B Maughan, Amitabha Chakrabarti

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|May 3, 2017

Summary

Total light scattering is split equally between forward diffraction and a newly identified "hump" from 2D to 3D diffraction crossover. This hump, visible in q-space, contains significant scattered light, especially for transparent particles.

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Last Updated: Mar 3, 2026

Scattering And Absorption of Light in Planetary Regoliths

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Area of Science:

Physics
Optics
Scattering Theory

Background:

Light scattering by particles is crucial in various scientific fields.
Previous models primarily focused on forward scattering lobes due to diffraction.

Purpose of the Study:

To quantify the contributions of different scattering mechanisms to the total scattering cross section.
To identify and characterize a previously unrecognized component of light scattering.

Main Methods:

Definition of partial scattering cross section and partial efficiencies.
Analysis of scattering patterns in q-space.
Investigation of the role of the refractive index, including its imaginary part.

Main Results:

Total scattering is composed of two approximately equal parts: forward diffraction and a 2D to 3D diffraction crossover.
A new scattering regime, termed the "hump," is identified in q-space, accounting for roughly half the scattered light.
The "hump" component is prominent for transparent particles and diminishes with a significant imaginary part of the refractive index.

Conclusions:

The total scattering of light by spheres is better understood by considering both forward diffraction and the 2D to 3D diffraction crossover.
The newly identified "hump" regime is a significant factor in light scattering, particularly for transparent particles.
The refractive index's imaginary component plays a critical role in the visibility of the "hump" feature.