Circularly polarized colour reflection from helicoidal structures in the beetle Plusiotis boucardi

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Circularly polarized colour reflection from helicoidal structures in the beetle Plusiotis boucardi

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dc.contributor.author Jewell, Sharon A. en_GB
dc.contributor.author Vukusic, Peter en_GB
dc.contributor.author Roberts, N. W. en_GB
dc.contributor.department University of Exeter; University of Manchester en_GB
dc.date.accessioned 2009-01-05T15:28:03Z en_GB
dc.date.accessioned 2011-01-25T11:55:16Z en_US
dc.date.accessioned 2013-03-20T13:18:03Z
dc.date.issued 2007 en_GB
dc.description.abstract A detailed optical study of the iridescent outer-shell of the beetle Plusiotis boucardi has revealed a novel microstructure which controls both the polarization and wavelength of reflected light. A previously unreported hexagonal array across the integument of the beetle exhibits highly localized regions of reflection of only red and green left-handed circularly-polarized light. Optical and transmission electron microscopy (TEM) imaging reveals the origin of this effect as an array of 'bowl-shaped' recesses on the elytra that are formed from a dual-pitch helicoidal layer. Reflectivity spectra collected from the beetle are compared to theoretical data produced using a multi-layer optics model for modelling chiral, optically anisotropic media such as cholesteric liquid crystals. Excellent agreement is obtained between data and theory produced using a model that incorporates an upper isotropic layer (of cuticular wax), followed by a short pitch (310 (± 1) nm) overlying a longer pitch (370 (±1) nm) helicoidal layer of optically anisotropic material. These layers are backed by an absorbing underlayer. Synthetic replication of this form of structure may provide a route to the fabrication of tuneable micro-mirrors for optical applications. en_GB
dc.identifier.citation 9, article 99 en_GB
dc.identifier.doi 10.1088/1367-2630/9/4/099 en_GB
dc.identifier.uri http://hdl.handle.net/10036/47059 en_GB
dc.language.iso en en_GB
dc.publisher Institute of Physics and Deutsche Physikalische Gesellschaft en_GB
dc.relation.url http://dx.doi.org/10.1088/1367-2630/9/4/099 en_GB
dc.relation.url http://www.iop.org/EJ/abstract/1367-2630/9/4/099 en_GB
dc.title Circularly polarized colour reflection from helicoidal structures in the beetle Plusiotis boucardi en_GB
dc.type Article en_GB
dc.date.available 2009-01-05T15:28:03Z en_GB
dc.date.available 2011-01-25T11:55:16Z en_US
dc.date.available 2013-03-20T13:18:03Z
dc.identifier.issn 1367-2630 en_GB
dc.description Copyright © 2007 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. This is the published version of an article published in New Journal of Physics Vol. 9, article 99. DOI: 10.1088/1367-2630/9/4/099 en_GB
dc.identifier.journal New Journal of Physics en_GB


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