Nicholas Kotov1
University of Michigan1
Nanoscale chirality is a rapidly emerging field in science and engineering. The early observation of giant circular dichroism for assemblies of gold nanoparticles due to their high polarizability and dimensional match with visible wavelengths. They encompass a large family of mirror-asymmetric constructs from metals, semiconductors, ceramics, and nanocarbons with multiple chiral geometries with characteristic scales from Ångströms to microns. Versatility in, scales, dimensions and polarizability of the inorganic materials enables their multiscale engineering to attain a broad range of optical and chemical properties. These capabilities as chiral materials enabled their fast technological translation for biosensing and optoelectronics, which, in turn, opened new venues for scientific inquiry into the unifying role chirality at the interface of materials science, biology, chemistry, and physics. <br/> In this talk the relationships between multiscale chirality, structural/functional complexity and strong chiroplasmonic activity will be established. The concept of chirality vectors with scale-specific chirality measures will be introduced. Engineering of the self-assembled structures wither complexity starting from the tetrahedrons of gold nanoparticles, twisted nanorods pairs, chains of gold nanorods and chiral superlattices from tetrahedrons will be discussed. These self-assembled structures open a pathway to a large family of complex hierarchical structures with gradually tunable chiroptical properties for biosensing and chiral photonics.<br/>References<br/>[1] W. Jiang, Z.-B. et al, Emergence of Complexity in Hierarchically Organized Chiral Particles, <i>Science</i>, <b>2020</b>, 368, 6491, 642-648.<br/> [2] L. Xu, et al, Enantiomer-Dependent Immunological Response to Chiral Nanoparticles<b>, </b><i>Nature,</i><b> 2022</b>, 601, 366–373.<br/>[3 Minjeong Cha, Emine Sumeyra Turali Emre, Xiongye Xiao, Ji-Young Kim, Paul Bogdan, J. Scott VanEpps, Angela Violi, Nicholas A. Kotov, Unifying Structural Descriptors for Biological and Bioinspired Nanoscale Complexes, <i>Nature Computational Science, </i><b>2022</b>, <i>2</i>, 243–252.<br/>[4] Shan Zhou, Jiahui Li, Jun Lu, Haihua Liu, Ahyoung Kim, Lehan Yao, Chang Liu, Chang Qian, Zachary D. Hood, Wenxiang Chen, Thomas E. Gage, Ilke Arslan, Alex Travesset, Kai Sun, Nicholas A. Kotov, and Qian Chen, Chiral Assemblies of Pinwheel Superlattices on Substrates, <i>Nature</i> 2022, accepted.