Photonically active bowtie nanoassemblies with chirality continuum

Prashant Kumar, Thi Vo, Minjeong Cha, Anastasia Visheratina, Ji-Young Kim, Wenqian Xu, Jonathan Schwartz, Alexander Simon, Daniel Katz, Valentin Paul Nicu, Emanuele Marino, Won Jin Choi, Michael Veksler, Si Chen, Christopher Murray, Robert Hovden, Sharon Glotzer () and Nicholas A. Kotov ()
Additional contact information
Prashant Kumar: University of Michigan
Thi Vo: University of Michigan
Minjeong Cha: University of Michigan
Anastasia Visheratina: University of Michigan
Ji-Young Kim: University of Michigan
Wenqian Xu: Argonne National Laboratory
Jonathan Schwartz: University of Michigan
Alexander Simon: University of Michigan
Daniel Katz: University of Michigan
Valentin Paul Nicu: Pro-Vitam Ltd
Emanuele Marino: University of Pennsylvania
Won Jin Choi: University of Michigan
Michael Veksler: University of Michigan
Si Chen: Argonne National Laboratory
Christopher Murray: University of Pennsylvania
Robert Hovden: University of Michigan
Sharon Glotzer: University of Michigan
Nicholas A. Kotov: University of Michigan

Nature, 2023, vol. 615, issue 7952, 418-424

Abstract: Abstract Chirality is a geometrical property described by continuous mathematical functions1–5. However, in chemical disciplines, chirality is often treated as a binary left or right characteristic of molecules rather than a continuity of chiral shapes. Although they are theoretically possible, a family of stable chemical structures with similar shapes and progressively tuneable chirality is yet unknown. Here we show that nanostructured microparticles with an anisotropic bowtie shape display chirality continuum and can be made with widely tuneable twist angle, pitch, width, thickness and length. The self-limited assembly of the bowties enables high synthetic reproducibility, size monodispersity and computational predictability of their geometries for different assembly conditions6. The bowtie nanoassemblies show several strong circular dichroism peaks originating from absorptive and scattering phenomena. Unlike classical chiral molecules, these particles show a continuum of chirality measures2 that correlate exponentially with the spectral positions of the circular dichroism peaks. Bowtie particles with variable polarization rotation were used to print photonically active metasurfaces with spectrally tuneable positive or negative polarization signatures for light detection and ranging (LIDAR) devices.

Date: 2023
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DOI: 10.1038/s41586-023-05733-1

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