Journal
JOURNAL OF OPTICS
Volume 16, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2040-8978/16/8/082001
Keywords
chiral material; twisted structure; golden-like scarab; broadband reflector
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Funding
- Universidad de Costa Rica
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Measured reflection spectra from elytra of Chrysina aurigans scarabs are reported. They show a broad reflection band for wavelengths from 0.525 to 1.0 mu m with a sequence of maxima and minima reflection values superimposed on a mean value of around 40% for the high reflection band. Different mechanisms contributing to the reflection spectra have been considered, with the dominant effect, reflection of left handed circularly polarized light, being produced by a laminated left handed twisted structure whose pitch changes with depth through the procuticle in a more complex way than that characterizing broad band circular polarizers based on cholesteric liquid crystals.
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