Polarizing properties and structural characteristics of the cuticle of the scarab Beetle Chrysina gloriosa
2014 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 571, no 3, 410-415 p.Article in journal (Refereed) Published
The scarab beetle Chrysina gloriosa is green with gold-colored stripes along its elytras. The properties of light reflected on these areas are investigated using Mueller-matrix spectroscopic ellipsometry. Both areas reflect light with high degree of left-handed polarization but this effect occurs for specular reflection for the gold-colored areas and for off-specular angles for the green areas. The colors and polarization phenomena originate from reflection of light in the cuticle and a structural analysis is presented to facilitate understanding of the different behaviors of these two areas. Scanning electron microscopy (SEM) images of the cross section of beetle cuticles show a multilayered structure. On the gold-colored areas the layers are parallel to the surface whereas on the green-colored areas they form cusp-like structures. Optical microscopy images show a rather flat surface in the gold-colored areas compared to the green-colored areas which display a net of polygonal cells with star-shaped cavities in the center. Each of the polygons corresponds to one of the cusps observed in the SEM images. Atomic force microscopy images of the star-shaped cavities are also provided. The roughness of the surface and the cusp-like structure of the green-colored areas are considered to cause scattering on this area.
Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 571, no 3, 410-415 p.
Scarab beetle; Near-circular polarization; Mueller-matrix spectroscopic ellipsometry
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:liu:diva-112885DOI: 10.1016/j.tsf.2013.11.149ISI: 000346055200013OAI: oai:DiVA.org:liu-112885DiVA: diva2:773373
ICSE-VI International Conference on Spectroscopic Ellipsometry May 2013
FunderSwedish Research CouncilKnut and Alice Wallenberg Foundation