Hierarchically manufactured chiral plasmonic nanostructures with gigantic chirality for polarized emission and information encryption

Yoon Ho Lee, Yousang Won, Jungho Mun, Sanghyuk Lee, Yeseul Kim, Bongjun Yeom, Letian Dou, Junsuk Rho () and Joon Hak Oh ()
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Yoon Ho Lee: Seoul National University
Yousang Won: Seoul National University
Jungho Mun: Pohang University of Science and Technology (POSTECH)
Sanghyuk Lee: Seoul National University
Yeseul Kim: Pohang University of Science and Technology (POSTECH)
Bongjun Yeom: Hanyang University
Letian Dou: Purdue University
Junsuk Rho: Pohang University of Science and Technology (POSTECH)
Joon Hak Oh: Seoul National University

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract Chiral metamaterials have received significant attention due to their strong chiroptical interactions with electromagnetic waves of incident light. However, the fabrication of large-area, hierarchically manufactured chiral plasmonic structures with high dissymmetry factors (g-factors) over a wide spectral range remains the key barrier to practical applications. Here we report a facile yet efficient method to fabricate hierarchical chiral nanostructures over a large area (>11.7 × 11.7 cm2) and with high g-factors (up to 0.07 in the visible region) by imparting extrinsic chirality to nanostructured polymer substrates through the simple exertion of mechanical force. We also demonstrate the application of our approach in the polarized emission of quantum dots and information encryption, including chiral quick response codes and anti-counterfeiting. This study thus paves the way for the rational design and fabrication of large-area chiral nanostructures and for their application in quantum communications and security-enhanced optical communications.

Date: 2023
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DOI: 10.1038/s41467-023-43112-6

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