Paper, Iridescent Insect Cuticles with Self-organized cholesteric patterns

Research conducted by Scarangella, Doldan, and Mitov focuses on biologically inspired designs with applications in materials science and potential anti-counterfeiting technology. It was shown that biological patterns found in fruits and insects contain a continuous structure while maintaining discontinuous color patterns.

Looking at insects, Exocuticle and indocuticle processes studied in the research involve the use of twisted cholesteric liquid crystals, causing spatial variations and refractions of light. These types of processes are difficult to replicate due to the discontinuous patterns and color structures of the cuticles. The research paper primarily focuses on the patternized iridescent carapaces of insects (specifically the scarab beetle Chrysina gloriosa) to find a way to replicate its variation in optical properties including cellular polygonal structure and wavelength micromirrors that all play a role in the its unique coloration and ability to reflect light.

Currently, the research shows promising uses for the future of anti-counterfeit technology. Biomimetic samples can be altered to implement graphic tags on a nano-scale, essentially creating a form of authentication in tangible materials. Encrypted physical tags can vary from nano-scale designs or even graphics that are visible to the naked eye. While trials have shown successes, the current technology cannot be reasonably replicated on an industrial scale.

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