Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 63: Poster: Quantum Dots and Optics
HL 63.16: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P1A
Biomimetic imitation of strongly scattering beetle scales — •Marie-Christin Angermann1 and Georg von Freymann1,2 — 1Physics Department and Research Center OPTIMAS, University of Kaiserslautern, Kaiserslautern, Germany — 2Fraunhofer Institute for Physical Measurement Techniques IPM, Kaiserslautern, Germany
The white beetle Chyphochilus is covered with 5 µm thick scales consisting of a chitin network. These scales reflect 80% of the light [1] and are strong scatterers. The composition of the scattering network is not yet understood.
To mimic the beetle, we therefore simplify this network with a tailored disordered model. The model bases on a periodic grid. All intersection points of the grid lines are shifted in up to 8 different directions. The shifting is determined by an aperiodic series, an approach similar to [2]. The optical response is theoretically calculated by a finite difference time domain method. Corresponding structures are fabricated via direct laser writing.
First results show a total reflectance of about 32% to 42% over the whole visible spectrum. The backscattered intensity is evenly distributed over the half space. The most important parameter for high reflectance is the number of layers. Furthermore, the distribution of the backscattered light depends on the disorder in a single layer. Further optimization might pave the way towards highly efficient scattering materials.
[1] Burresi, M., et al. Scientific reports 4, 6075 (2014)
[2] Renner, M., et al. Scientific reports 5, 13129 (2015)