Chirality encoding in resonant metasurfaces governed by lattice symmetries

Ivan Sinev, Felix Ulrich Richter, Ivan Toftul, Nikita Glebov, Kirill Koshelev, Yongsop Hwang, David G. Lancaster, Yuri Kivshar () and Hatice Altug ()
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Ivan Sinev: École Polytechnique Fédérale de Lausanne (EPFL)
Felix Ulrich Richter: École Polytechnique Fédérale de Lausanne (EPFL)
Ivan Toftul: Australian National University
Nikita Glebov: École Polytechnique Fédérale de Lausanne (EPFL)
Kirill Koshelev: Australian National University
Yongsop Hwang: University of South Australia
David G. Lancaster: University of South Australia
Yuri Kivshar: Australian National University
Hatice Altug: École Polytechnique Fédérale de Lausanne (EPFL)

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract Chiral metasurfaces provide invaluable tools for controlling structured light required for biosensing, photochemistry, holography, and quantum photonics. Here we suggest and realize a universal strategy for engineering chiral response of resonant metasurfaces via the interplay of meta-atom geometry and lattice arrangements within all five possible planar Bravais symmetries. By introducing chiral gradient metasurfaces, we illustrate how our approach allows producing a predictable chiral response tunable by simple parameter variations. We highlight that the symmetry-controlled chiral response provides an additional degree of freedom in optical signal processing, and showcase this with simultaneous mid-IR image encoding in two fundamental quantities, transmission and circular dichroism. Our proposed concept represents a universal toolkit for on-demand design and control of chiral metastructures that has potential for numerous applications in life sciences, quantum optics and more.

Date: 2025
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DOI: 10.1038/s41467-025-61221-2

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