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Scattering and Polarization Properties of the Scarab Beetle Cyphochilus insulanus cuticle
Linköping University, Department of Physics, Chemistry and Biology, Applied Optics . Linköping University, The Institute of Technology. Division of Sensor and Electronic Warfare, Swedish Defence Research Agency (FOI), Linköping, Sweden .
Linköping University, Department of Physics, Chemistry and Biology, Applied Optics . Linköping University, The Institute of Technology.ORCID iD: 0000-0001-9229-2028
Division of Sensor and Electronic Warfare, Swedish Defence Research Agency (FOI), Linköping, Sweden .
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
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2015 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 54, no 19Article in journal (Refereed) Published
Abstract [en]

Optical properties of natural photonic structures can inspire material developments in diversified areas, such as the spectral design of surfaces for camouflage. Here, reflectance, scattering, and polarization properties of the cuticle of the scarab beetle Cyphochilus insulanus are studied with spectral directional hemispherical reflectance, bidirectional reflection distribution function (BRDF) measurements, and Mueller-matrix spectroscopic ellipsometry (MMSE). At normal incidence, a reflectance (0.6–0.75) is found in the spectral range of 400–1600 nm and a weaker reflectance <0.2  in the UV range as well as for wavelengths >1600  nm  . A whiteness of 𝑊=42  is observed for mainly the elytra of the beetle. Chitin is a major constituent of the insect cuticle which is verified by the close similarity of the measured IR spectrum to that of 𝛼  -chitin. The BRDF signal shows close-to-Lambertian properties of the beetle for visible light at small angles of incidence. From the MMSE measurement it is found that the beetles appear as dielectric reflectors reflecting linearly polarized light at oblique incidence with low gloss and a low degree of polarization. The measured beetle properties are properties that can be beneficial in a camouflage material.

Place, publisher, year, edition, pages
Optical Society of America, 2015. Vol. 54, no 19
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-115368DOI: 10.1364/AO.54.006037ISI: 000357339200023OAI: oai:DiVA.org:liu-115368DiVA: diva2:843892
Available from: 2015-03-13 Created: 2015-03-13 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Optical Studies of Materials for Spectral Design
Open this publication in new window or tab >>Optical Studies of Materials for Spectral Design
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Optical material properties have been studied in a wide wavelength range. Theaim is future use of spectral design for camou age. The main characterization techniques used in this work are Refection Spectroscopy, Scatterometry (BRDF) and Mueller Matrix Ellipsometry. Six camouflage evaluation criteria based on reflection, emissivity, polarization, gloss, dynamic coloring and broadband properties, are to a greater or lesser degree related to the interaction between light and materia. Almost all are connected to the work of this thesis and are exemplied through dierent material categories with potential for use in camouföage applications. The included papers presents: a broad band (visible-infrared-microwave) study, two examples of dynamic optical properties of thin lms, and polarization and scattering properties of a natural surface.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2015. 29 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1712
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-115369 (URN)10.3384/lic.diva-115369 (DOI)978-91-7519-106-5 (ISBN)
Presentation
2015-04-10, Planck, Fysikhuset, Campus US, Linköpings universitet, Linköping, 10:15 (Swedish)
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Available from: 2015-03-13 Created: 2015-03-13 Last updated: 2016-06-28Bibliographically approved

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