Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Poster Session I
CPP 20.2: Poster
Montag, 12. März 2018, 17:30–19:30, Poster A
Imitation of scattering networks by foam models — •Dominic Meiers1, Marie-Christin Angermann1, and Georg von Freymann1,2 — 1Physics Department and Research Center OPTIMAS, University of Kaiserslautern, Kaiserslautern, Germany — 2Fraunhofer Institute for Industrial Mathematics ITWM, Kaiserslautern, Germany
The wing scales of the beetle Cyphochilus show one of the highest whiteness and brightness found in nature, although they are only about 5 μm thick [1]. This brilliant whiteness is achieved by multiple light scattering in the inner disordered chitin network of the scales [2]. To model and optimize this network, a foam model generator (GeoDict) is used. This foam has an inner structure comparable to the beetle's network. By varying the parameters of generation, the optical properties are optimized in respect of whiteness and brightness. Therefore, the optical response is calculated by using a finite difference time domain method. Moreover, the foam structure is compared with the measurement-based model of the chitin network shown in [3]. Subsequent steps are the further improvement of the foam structure and its fabrication via 3D direct laser writing. Eventually, it might be possible to create artificial structures that are comparable to the beetle's wing scales in the near future.
[1] P. Vukusic, B. Hallam, J. Noyes, Science 315, 5810 (2007). [2] M. Burresi et al., Scientific Reports 4, 6075 (2014). [3] B. Wilts et al., Adv. Mater. 2017, 1702057 (2017).