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Evidence for a dispersion relation of optical modes in the cuticle of the scarab beetle Cotinis mutabilis
Linköping University, Department of Physics, Chemistry and Biology, Applied Optics . Linköping University, The Institute of Technology. Cinvestav-Querétaro, Mexico.
Cinvestav-Querétaro, Mexico.
Linköping University, Department of Physics, Chemistry and Biology, Applied Optics . Linköping University, The Institute of Technology.ORCID iD: 0000-0003-2749-8008
Linköping University, Department of Physics, Chemistry and Biology, Applied Optics . Linköping University, The Institute of Technology.ORCID iD: 0000-0001-9229-2028
2014 (English)In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 4, no 12, 2484-2496 p.Article in journal (Refereed) Published
Abstract [en]

Variable angle Mueller matrix spectroscopic ellipsometry is used to study the properties of light reflected from the exoskeleton (cuticle) of the scarab beetle Cotinis mutabilis. For unpolarized incident light, the ellipticity and degree of polarization of the reflected light reveal a lefthanded helical structure in the beetle cuticle. Analysis of the spectral position of the maxima and minima in the interference oscillations of the Mueller-matrix elements provides evidence for a dispersion relation similar to that of optical modes in chiral nematic liquid crystals calculated within a two-wave approximation. Additionally, a structural model for the cuticle of C. mutabilis is derived from the properties of the optical modes for nonattenuated propagation or selective reflection.

Place, publisher, year, edition, pages
Optical Society of America, 2014. Vol. 4, no 12, 2484-2496 p.
Keyword [en]
Chiral media; Anisotropic optical materials; Polarization; Ellipsometry and polarimetry; Optical properties
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-112742DOI: 10.1364/OME.4.002484ISI: 000346034100004OAI: oai:DiVA.org:liu-112742DiVA: diva2:770530
Available from: 2014-12-10 Created: 2014-12-10 Last updated: 2017-12-05Bibliographically approved

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Mendoza, ArturoJärrendahl, KennethArwin, Hans
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