Nanostructured antireflective and thermoisolative cicada wings

Morikawa, J, Ryu, M, Seniutinas, G, Balčytis, A, Maximova, K, Wang, X, Zamengo, M, Ivanova, E and Juodkazis, S 2016, 'Nanostructured antireflective and thermoisolative cicada wings', Langmuir, vol. 32, no. 18, pp. 4698-4703.

Document type: Journal Article
Collection: Journal Articles

Title Nanostructured antireflective and thermoisolative cicada wings
Author(s) Morikawa, J
Ryu, M
Seniutinas, G
Balčytis, A
Maximova, K
Wang, X
Zamengo, M
Ivanova, E
Juodkazis, S
Year 2016
Journal name Langmuir
Volume number 32
Issue number 18
Start page 4698
End page 4703
Total pages 6
Publisher American Chemical Society
Abstract Inter-related mechanical, thermal, and optical macroscopic properties of biomaterials are defined at the nanoscale by their constituent structures and patterns, which underpin complex functions of an entire bio-object. Here, the temperature diffusivity of a cicada (Cyclochila australasiae) wing with nanotextured surfaces was measured using two complementary techniques: a direct contact method and IR imaging. The 46-μm-thick wing section was shown to have a thermal diffusivity of α⊥ = (0.71 ± 0.15) × 107 m2/s, as measured by the contact temperature wave method along the thickness of the wing; it corresponds to the inherent thermal property of the cuticle. The in-plane thermal diffusivity value of the wing was determined by IR imaging and was considerably larger at α∥ = (3.6 ± 0.2) × 107 m2/s as a result of heat transport via air. Optical properties of wings covered with nanospikes were numerically simulated using an accurate 3D model of the wing pattern and showed that light is concentrated between spikes where intensity is enhanced by up to 3- to 4-fold. The closely packed pattern of nanospikes reduces the reflectivity of the wing throughout the visible light spectrum and over a wide range of incident angles, hence acting as an antireflection coating.
Subject Microbiology not elsewhere classified
DOI - identifier 10.1021/acs.langmuir.6b00621
Copyright notice © 2016 American Chemical Society
ISSN 0743-7463
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