Colloidal self-assembly allows rational design of structures on the micrometer and submicrometer scale. One architecture that can generate complete 3D photonic band gaps is the diamond cubic lattice, which has remained difficult to realize at length scales comparable to the wavelength of visible or ultraviolet light. Here, we demonstrate three-dimensional photonic crystals self-assembled from DNA origami that act as precisely programmable patchy colloids. Our DNA-based nanoscale tetrapods crystallize into a rod-connected diamond cubic lattice with a periodicity of 170 nm. This structure serves as a scaffold for atomic layer deposition of high refractive index materials such as TiO2, yielding a tunable photonic band gap in the near-ultraviolet.
@article{arxiv.2310.10884,
title = {Diamond-lattice photonic crystals assembled from DNA origami},
author = {Gregor Posnjak and Xin Yin and Paul Butler and Oliver Bienek and Mihir Dass and Ian D. Sharp and Tim Liedl},
journal= {arXiv preprint arXiv:2310.10884},
year = {2024}
}