Abstract:
:The cuticle of the beetle Chrysina chrysargyrea reflects left-handed polarized light in the broad spectral range from 340 to 1000 nm. Interference oscillations in the experimental Mueller-matrix spectroscopic ellipsometry data reveal that transparent materials comprise the cuticle. A spectral analysis of the interference oscillations makes evident that the pitch profile across the cuticle is graded. The graded pitch and effective refractive indices are determined through non-linear regression analysis of the experimental Mueller matrix by using a cuticle model based on twisted biaxial dielectric slices. Non-uniformity in cuticle thickness as well as in pitch profile near the cuticle surface account for depolarizance of the Mueller matrix. Transmission electron microscopy supports the reliability of the results.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Mendoza-Galván A,Del Río LF,Järrendahl K,Arwin Hdoi
10.1038/s41598-018-24761-wsubject
Has Abstractpub_date
2018-04-24 00:00:00pages
6456issue
1issn
2045-2322pii
10.1038/s41598-018-24761-wjournal_volume
8pub_type
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