Student Fabrication of bioinspired structural colors by Two-Photon PolymerizationFriday (26.06.2020) 09:50 - 10:10 Room 1
In nature, most of coloration occur due to the optical properties of electrons in atoms and molecules. However, colors can also result from interference, diffraction or scattering of light. Those colors are referred to structural coloration which are often used by animal or plants to create display functions. For this purpose, the incident light is manipulated by sophisticated surface structuring with periodic nanoscaled features. Additionally, those periodic features are often arranged or organized not perfectly so that structural coloration mostly arises from a combination of the aforementioned physical effects. Particularly, the disorder of those photonic systems plays an important role to generate extraordinary optical properties, e.g. the almost angle-independency of coloration, which can be extremely interesting for industry to develop new products. The most famous organism in this field is possibly the butterfly Morpho because of its high intense blue coloration which can be observed in a wide angle. In this work, we discuss the generation of bioinspired structural colors by mimicking the characteristics of the natural photonic system of M. didius using Two-Photon Polymerization (2PP). 2PP is particularly beneficial for this purpose because of its ability to produce easily arbitrary 3d structures with high lateral resolution. However, taking into account conventional polymerization procedure, the high axial resolution of 2PP makes it impossible to replicate the smallest structure features of the butterfly. Nevertheless, two fabrication approaches will be presented to generate structures which are comparable to those are found in the scale of M. didius. Those structures create a multilayer systems consisting of air and polymer with specific disorder characteristics. These multilayer systems produce a blue structural color with almost angle-independent optical properties. Furthermore, different structural geometries are used in order to adjust the extraordinary optical properties depending on the viewing direction on the colored surface. Also different colors are fabricated by modifying the bionic multilayer systems. In this context, the meaning of disorder is also discussed. Bionic structures are characterized using scanning electron microscopy. A spectral analysis is performed with angle-resolved ellipsometry. Finally, the results can be used to open up potential applications for sensors or anti-counterfeit systems.
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