Helical polymers for dissymmetric circularly polarized light imaging

Inho Song, Jaeyong Ahn, Hyungju Ahn, Sang Hyuk Lee, Jianguo Mei, Nicholas A. Kotov () and Joon Hak Oh ()
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Inho Song: Seoul National University
Jaeyong Ahn: Seoul National University
Hyungju Ahn: Pohang University of Science and Technology
Sang Hyuk Lee: Seoul National University
Jianguo Mei: Purdue University
Nicholas A. Kotov: University of Michigan
Joon Hak Oh: Seoul National University

Nature, 2023, vol. 617, issue 7959, 92-99

Abstract: Abstract Control of the spin angular momentum (SAM) carried in a photon provides a technologically attractive element for next-generation quantum networks and spintronics1–5. However, the weak optical activity and inhomogeneity of thin films from chiral molecular crystals result in high noise and uncertainty in SAM detection. Brittleness of thin molecular crystals represents a further problem for device integration and practical realization of chiroptical quantum devices6–10. Despite considerable successes with highly dissymmetric optical materials based on chiral nanostructures11–13, the problem of integration of nanochiral materials with optical device platforms remains acute14–16. Here we report a simple yet powerful method to fabricate chiroptical flexible layers via supramolecular helical ordering of conjugated polymer chains. Their multiscale chirality and optical activity can be varied across the broad spectral range by chiral templating with volatile enantiomers. After template removal, chromophores remain stacked in one-dimensional helical nanofibrils producing a homogeneous chiroptical layer with drastically enhanced polarization-dependent absorbance, leading to well-resolved detection and visualization of SAM. This study provides a direct path to scalable realization of on-chip detection of the spin degree of freedom of photons necessary for encoded quantum information processing and high-resolution polarization imaging.

Date: 2023
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DOI: 10.1038/s41586-023-05877-0

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