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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 19 — Sep. 23, 2013
  • pp: 22645–22656

Cuticle structure of the scarab beetle Cetonia aurata analyzed by regression analysis of Mueller-matrix ellipsometric data

Hans Arwin, Torun Berlind, Blaine Johs, and Kenneth Järrendahl  »View Author Affiliations

Optics Express, Vol. 21, Issue 19, pp. 22645-22656 (2013)

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Since one hundred years it is known that some scarab beetles reflect elliptically and near-circular polarized light as demonstrated by Michelson for the beetle Chrysina resplendens. The handedness of the polarization is in a majority of cases left-handed but also right-handed polarization has been found. In addition, brilliant colors with metallic shine are observed. The polarization and color effects are generated in the beetle exoskeleton, the so-called cuticle. The objective of this work is to demonstrate that structural parameters and materials optical functions of these photonic structures can be extracted by advanced modeling of spectral multi-angle Mueller-matrix data recorded from beetle cuticles. A dual-rotating compensator ellipsometer is used to record normalized Mueller-matrix data in the spectral range 400 – 800 nm at angles of incidence in the range 25–75°. Analysis of data measured on the scarab beetle Cetonia aurata are presented in detail. The model used in the analysis mimics a chiral nanostructure and is based on a twisted layered structure. Given the complexity of the nanostructure, an excellent fit between experimental and model data is achieved. The obtained model parameters are the spectral variation of the refractive indices of the cuticle layers and structural parameters of the chiral structure.

© 2013 OSA

OCIS Codes
(160.1190) Materials : Anisotropic optical materials
(310.6860) Thin films : Thin films, optical properties
(160.1585) Materials : Chiral media
(310.5448) Thin films : Polarization, other optical properties
(240.2130) Optics at surfaces : Ellipsometry and polarimetry

ToC Category:
Thin Films

Original Manuscript: June 13, 2013
Revised Manuscript: August 22, 2013
Manuscript Accepted: September 9, 2013
Published: September 18, 2013

Virtual Issues
Vol. 8, Iss. 10 Virtual Journal for Biomedical Optics

Hans Arwin, Torun Berlind, Blaine Johs, and Kenneth Järrendahl, "Cuticle structure of the scarab beetle Cetonia aurata analyzed by regression analysis of Mueller-matrix ellipsometric data," Opt. Express 21, 22645-22656 (2013)

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