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Related Experiment Video

Updated: Jun 22, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Backscattering of light from disk-like particles with aperiodic angular fine structure.

Howard R Gordon

|June 25, 2009

Summary

This summary is machine-generated.

The backscattering of light by disk-like particles is similar for periodic and aperiodic internal structures when averaged. This justifies using perfectly periodic structures for modeling detached coccoliths.

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Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

Published on: May 20, 2013

Area of Science:

Optical physics
Biophysics
Materials science

Background:

Backscattering cross section (sigmab) is crucial for understanding light-particle interactions.
Disk-like particles with internal structures are relevant in biological and material contexts.
Previous models often assume perfect periodicity, which may not always hold true.

Purpose of the Study:

To compare the backscattering cross section (sigmab) of disk-like particles with periodic versus aperiodic internal structures.
To determine if averaging over aperiodic structures yields results comparable to periodic ones.
To assess the validity of using perfectly periodic structures for modeling specific natural particles.

Main Methods:

Numerical computation of backscattering cross section (sigmab).
Modeling randomly-oriented disk-like particles with refractive index 1.20.
Introducing aperiodic structures by randomly perturbing periodic ones.
Averaging sigmab over multiple realizations of aperiodic structures.

Main Results:

Individual aperiodic particle backscattering can differ significantly from periodic counterparts.
Averaging sigmab over several aperiodic realizations converges with periodic results.
Convergence is maintained unless the degree of aperiodicity is excessively large.

Conclusions:

The use of perfectly periodic internal structures is justified for modeling the backscattering of detached coccoliths from E. Huxleyi.
Averaging effects can reconcile differences between periodic and aperiodic particle scattering.
The degree of aperiodicity is a critical factor in the applicability of simplified models.