Abstract
A successful realization of photonic systems with characteristics of the Morpho butterfly coloration is reported using two-photon polymerization. Submicron structure features have been fabricated through the interference of the incident beam and the reflected beam in a thin polymer film. Furthermore, the influence of the lateral microstructure organization on the color formation has been studied in detail. The design of the polymerized structures was validated by scanning electron microscopy. The optical properties were analyzed using an angle-resolved spectrometer. Tunable angle-independence, based on reflection intensity modulation, has been investigated by using photonic structures with less degree of symmetry. Finally, these findings were used to demonstrate the high potential of two-photon polymerization in the field of biomimetic research and for technical application, e.g. for sensing and anti-counterfeiting.
Highlights
In our everyday life, coloration has a particular significance due to its psychological effects and diverse applications with various functionalities
An enormous potential is provided by the biomimicry of optical properties which are found in structural color systems in nature
The biomimetic systems consist of hierarchically micro- and nanostructure which form a multlayer system
Summary
Coloration has a particular significance due to its psychological effects and diverse applications with various functionalities. There are offsets and diverse inclines between the lamellar ridges inside a single wing scale Those differences lead to diffraction and scattering which are responsible for the angle-independent properties [9,10,15,17]. Hierarchical microstructure systems can be generated by 2PP using a thin-film of the base material for the polymerization process In this case, a wavy substructure feature arises inside the cross section of a single polymerized line by the interference between the focused laser and the back reflection at the boundary layer [38,39,40,41].
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