Fabrication and Optical Analysis of Guanine Based Photonic Films
Garg, Sadhya
2021
- Naturally occurring photonic crystals can be found in species ranging from copepods to butterflies, and are responsible for structural color phenomena such as iridescence and broadband reflectance. In particular, the characteristic reflectance of fish skin can be attributed to one dimensional periodic nanostructures made up of alternating layers of guanine and cytoplasm. As our understanding of ... read morethese natural systems has grown, so has our desire to fabricate devices that mimic their behavior. The fabrication of bio-inspired optical devices has thus become an important pursuit of modern biotechnology.These optical structures are the inspiration for the following dissertation, which examines the functionality of photonic films composed of synthetic guanine. Specifically, we find that, though biogenic guanine crystals can be extracted from commercially available fish cuts, synthetically produced crystals — fabricated using a DMSO-based recrystallization method — are both morphologically similar and better suited for thin film casting. Furthermore, through numerical simulations, we establish that synthetic guanine can theoretically be used in conjunction with silk fibroin to form man-made multilayers with high intensity reflection in the visible spectrum.read less
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