Covert linear polarization signatures from brilliant white two-dimensional disordered wing structures of the phoenix damselfly
Abstract
The damselflyPseudolestes mirabilisreflects brilliant white on the ventral side of its hindwings and a copper-gold colour on the dorsal side. Unlike many previous investigations of odonate wings, in which colour appearances arise either from multilayer interference or from wing-membrane pigmentation, the whiteness on the wings ofP. mirabilisresults from light scattered by a specialized arrangement of flattened waxy fibres and the copper-gold colour is produced by pigment-based filtering of this light scatter. The waxy fibres responsible for this optical signature effectively form a structure that is disordered in two dimensions and this also gives rise to distinct optical linear polarization. It is a structure that provides a mechanism enablingP. mirabilisto display its bright wing colours efficiently for territorial signalling, both passively while perched, in which the sunlit copper-gold upperside is presented against a highly contrasting background of foliage, and actively in territorial contests in which the white underside is also presented. It also offers a template for biomimetic high-intensity broadband reflectors that have a pronounced polarization signature.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 01, 2017
- Source ID
- 10.1098/rsif.2017.0036
Entities
People
- Albert G. Orr
- Matthew Nixon
- P. Vukusic
Organizations
- Air Force Office of Scientific Research
- Griffith University
- University of Exeter