Berlin 2008 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 13: Optical Layers: Basic Research and Applications
DS 13.4: Vortrag
Dienstag, 26. Februar 2008, 11:15–11:30, H 2032
Reproduction of natural structural colours in thin film coatings — •Mathias Kolle1, Heather Whitney2, Ulrich Wiesner3, and Ullrich Steiner1 — 1Cavendish Laboratories, Department of Physics, Cambridge University, UK — 2Department of Plant Sciences, University of Cambridge, UK — 3Materials Science Department, University of Cornell, Ithaca, USA
For many organisms in nature intense and distinctive colours play an important role in inter- and intra-species communication. Thus striking colours are well developed in nature and the most impressive natural colours actually arise from micrometre- to nanometre-sized structures, which often consist of intrinsically transparent materials.
Most of the underlying physical principles that create colour from mere transparent materials are well understood and the challenge lies in applying them to create artificial replicas of natural structural colours.
Nature shows that outstanding colours result in general from a balanced combination of various optical effects. Likewise we aim to create coatings based on nature-similar structures that optimally exploit different optical effects such as multilayer interference, diffraction from lateral structures as well as fluorescence.
Efficient, simple procedures and a variety of polymers and inorganic materials are used and will be subject of this presentation. Such coatings promise a wide range of applications only to mention unique labels in security applications to protect for instance credit cards, passports or banknotes from forgery.