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Proceedings Paper

Nanoarchitecture in the black wings of Troides magellanus: a natural case of absorption enhancement in photonic materials
Author(s): Aline Herman; Cédric Vandenbem; Olivier Deparis; Priscilla Simonis; Jean Pol Vigneron
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Paper Abstract

The birdwings butterfly Troides magellanus possesses interesting properties for light and thermal radiation management. The black wings of the male exhibit strong (98%) absorption of visible light as well as two strong absorption peaks in the infrared (3 μm and 6 μm) both due to chitin. These peaks are located in the spectral region where the black body emits at 313K. The study of absorption enhancement in this butterfly could be helpful to design highly absorbent biomimetic materials. Observations of the wings using a scanning electron microscope (SEM) reveal that the scales covering the wings are deeply nanostructured. A periodic three-dimensional (3D) model of the scale nanoarchitecture is elaborated and used for numerical transfer-matrix simulations of the absorption spectrum. The complex refractive index of the wing material is approximated by a multi-oscillator Lorentz model, leading to a broad absorption in the visible range as well as two peaks in the infrared. The absorption peak intensities turn out to be dependent on the complexity of the nanostructures. This result clearly demonstrates a structural effect on the absorption. Finally, a comparison with a planar layer of identical refractive index and material volume lead us to conclude that the absorption is enhanced by nanostructures.

Paper Details

Date Published: 7 September 2011
PDF: 12 pages
Proc. SPIE 8094, Nanophotonic Materials VIII, 80940H (7 September 2011); doi: 10.1117/12.890946
Show Author Affiliations
Aline Herman, Facultes Univ. Notre Dame de la Paix (Belgium)
Cédric Vandenbem, Facultes Univ. Notre Dame de la Paix (Belgium)
Olivier Deparis, Facultes Univ. Notre Dame de la Paix (Belgium)
Priscilla Simonis, Facultes Univ. Notre Dame de la Paix (Belgium)
Jean Pol Vigneron, Facultes Univ. Notre Dame de la Paix (Belgium)

Published in SPIE Proceedings Vol. 8094:
Nanophotonic Materials VIII
Stefano Cabrini; Taleb Mokari, Editor(s)

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