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Pitch profile across the cuticle of the scarab beetle Cotinis mutabilis determined by analysis of Mueller matrix measurements
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. CINVESTAV, Mexico.
CINVESTAV, Mexico.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-2749-8008
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-9229-2028
2018 (English)In: Royal Society Open Science, E-ISSN 2054-5703, Vol. 5, no 12, article id 181096Article in journal (Refereed) Published
Abstract [en]

Helicoidal structures of lamellae of nanofibrils constitute the cuticle of some scarab beetle; with iridescent metallic-like shine reflecting left-handed polarized light. The spectral and polarization properties of the reflected light depend on the pitch of the helicoidal structures, dispersion of effective refractive indices and thicknesses of layers in the cuticle. By modelling the outer exocuticle of the scarab beetle Cotinis mutabilis as a stack of continuously twisted biaxial slices of transparent materials, we extract optical and structural parameters by nonlinear regression analysis of variable-angle Mueller-matrix spectroscopic data. Inhomogeneities in the beetle cuticle produce depolarization with non-uniformity in cuticle thickness as the dominant effect. The pitch across the cuticle of C. mutabilis decreased with depth in a two-level profile from 380 to 335 nm and from 390 to 361 nm in greenish and reddish specimens, respectively, whereas in a yellowish specimen, the pitch decreased with depth in a three-level profile from 388 to 326 nm.

Place, publisher, year, edition, pages
ROYAL SOC , 2018. Vol. 5, no 12, article id 181096
Keywords [en]
structural colour; natural photonic structures; Bragg reflection; Bouligand structures
National Category
Evolutionary Biology
Identifiers
URN: urn:nbn:se:liu:diva-154732DOI: 10.1098/rsos.181096ISI: 000456566500017PubMedID: 30662728OAI: oai:DiVA.org:liu-154732DiVA, id: diva2:1292102
Note

Funding Agencies|Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]

Available from: 2019-02-27 Created: 2019-02-27 Last updated: 2019-03-15

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Mendoza, ArturoJärrendahl, KennethArwin, Hans
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