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BP: Fachverband Biologische Physik

BP 18: Biomaterials and Biopolymers (joint session BP/CPP)

BP 18.9: Vortrag

Mittwoch, 20. März 2024, 12:00–12:15, H 1028

DNA-Origami Diamond Crystal with photonic bandgap in the UV Range — •Xin Yin¹, Gregor Posnjak¹, Paul Butler², Oliver Bienek², Mihir Dass¹, Ian Sharp², and Tim Liedl¹ — ¹Ludwig-Maximilian-Universität München, Germany — ²Walter Schottky Institute, Technical University Munich, Germany

Diamond lattice photonic crystals possess a broad complete photonic bandgap, although its manufacturing has proven challenging. [1] We showcase a DNA origami diamond crystal with 170 nm periodicity. [2] DNA origami is a technique that allows the rational design of complex geometries on the nanoscale, [3] which we apply to build tetrapod single units for the crystal. Pristine crystal formation requires careful control of interactions between the monomers. The thus-formed crystal undergoes silicification, via a wet chemistry method, for enhanced mechanical stability, followed by TiO2 coating via atomic layer deposition (ALD). The latter process is required to increase the refractive index and thus open the photonic bandgap. Optical measurement reveals a reflection band in UV range, with the peak red shifting as the coating thickness increases. These results align well with simulations predicting the structure's photonic properties. [1] R. K. Cersonsky, J. Antonaglia, B. D. Dice, & S. C. Glotzer. Nature communications, 12(1), 2543. [2] G. Posnjak, X. Yin, P. Butler, O. Bienek, M. Dass, I. D. Sharp, & T. Liedl, arXiv preprint arXiv:2310.10884. [3] P. W. Rothemund. Nature, 440(7082), 297-302.

Keywords: DNA Origami; Photonic Crystal; Diamond Lattice; DNA Origami Crystal