%0 Journal Article
%A Wilts, B.D.
%A Michielsen, K.
%A Kuipers, J.
%A De Raedt, H.
%A Stavenga, D.G.
%T Brilliant camouflage: photonic crystals in the diamond weevil, Entimus imperialis
%J Proceedings of the Royal Society of London / B
%V 279
%@ 0962-8452
%C London
%I The Royal Society
%M PreJuSER-20254
%P 2524 - 2530
%D 2012
%Z We thank H. L. Leertouwer and A. J. M. Vey for collaboration and P. Vukusic for reading an early version of this manuscript. This study was financially supported by AFOSR/EOARD (grant FA8655-08-1-3012) and NCF, The Netherlands.
%< .
%X The neotropical diamond weevil, Entimus imperialis, is marked by rows of brilliant spots on the overall black elytra. The spots are concave pits with intricate patterns of structural-coloured scales, consisting of large domains of three-dimensional photonic crystals that have a diamond-type structure. Reflectance spectra measured from individual scale domains perfectly match model spectra, calculated with anatomical data and finite-difference time-domain methods. The reflections of single domains are extremely directional (observed with a point source less than 5°), but the special arrangement of the scales in the concave pits significantly broadens the angular distribution of the reflections. The resulting virtually angle-independent green coloration of the weevil closely approximates the colour of a foliaceous background. While the close-distance colourful shininess of E. imperialis may facilitate intersexual recognition, the diffuse green reflectance of the elytra when seen at long-distance provides cryptic camouflage.
%K Animals
%K Beetles: chemistry
%K Beetles: physiology
%K Beetles: ultrastructure
%K Behavior, Animal
%K Computer Simulation
%K Crystallization
%K Microscopy, Electron, Transmission
%K Photons
%K Pigmentation
%K Refractometry
%K Wing: chemistry
%K Wing: ultrastructure
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:22378806
%2 pmc:PMC3350696
%U <Go to ISI:>//WOS:000304453000005
%R 10.1098/rspb.2011.2651
%U https://juser.fz-juelich.de/record/20254