Structural optimization for broadband scattering in several ultra-thin white beetle scales

Recent work discovered the remarkable optical scattering properties of the scales of the white beetle Cyphochilus. It was suggested that its brilliant whiteness and brightness were due to optimization of the microstructure within its scales. Here we compare the microstructure of Cyphochilus scales t...

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Published in:Applied optics. Optical technology and biomedical optics 2010-08, Vol.49 (22), p.4246
Main Authors: Luke, Stephen M, Hallam, Benny T, Vukusic, Peter
Format: Article
Language:English
Subjects:
Animals
Anisotropy
Biophysics - methods
Coleoptera - ultrastructure
Lasers
Light
Microscopy, Electron, Scanning - methods
Microscopy, Electron, Transmission - methods
Optics and Photonics
Refractometry
Scattering, Radiation
Species Specificity
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Hallam, Benny T
Vukusic, Peter
description Recent work discovered the remarkable optical scattering properties of the scales of the white beetle Cyphochilus. It was suggested that its brilliant whiteness and brightness were due to optimization of the microstructure within its scales. Here we compare the microstructure of Cyphochilus scales to those of two other white beetles, Lepidiota stigma and Calothyrza margaritifera. Extensive optical modeling and experimental data suggest that each species displays structural optimization designed to maximize optical scatter. Optimization of the scale filling fraction is observed, as well as optimization of scattering center spacing and diameter. Cyphochilus, in particular, displays a high degree of structural optimization, resulting in its bright white appearance.
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subjects Animals
Anisotropy
Biophysics - methods
Coleoptera - ultrastructure
Lasers
Light
Microscopy, Electron, Scanning - methods
Microscopy, Electron, Transmission - methods
Optics and Photonics
Refractometry
Scattering, Radiation
Species Specificity
title Structural optimization for broadband scattering in several ultra-thin white beetle scales
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