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  • Letter
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Nanoscale chirality enhancement using topology-designed three-dimensional dielectric nanogap antennas

Atsushi Taguchi1,*, Yamato Fukui2, and Keiji Sasaki1

  • 1Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido 001-0020, Japan
  • 2Graduate School of Information Science and Technology, Hokkaido University, Sapporo 060-0814, Japan

  • *Contact author: taguchi@es.hokudai.ac.jp
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Phys. Rev. Applied 23, L021002 – Published 11 February, 2025

DOI: https://doi.org/10.1103/PhysRevApplied.23.L021002

Abstract

We have explored, using topology optimization, three-dimensional (3D) chiral-nanogap antennas for circular-to-linear polarization conversion between far and near fields. The topology-designed 3D nanogap structures exhibit a giant chiral dissymmetry (g=−1.70) in gap-mode intensity against the handedness of the incident polarization. We have found that the linearly polarized gap field, designed for counterpropagating circularly polarized light, retains optical chirality localized at the subwavelength mode volume. With the nanoscale-chirality enhancement demonstrated, machine-aided designs of 3D chiral nanostructures offer a promising platform for amplifying chiral light-matter interactions with structured light at the nanoscale.

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Phys. Rev. Applied 23, L021002– Published 11 February, 2025
  • Received 16 February 2024
  • Revised 17 January 2025
  • Accepted 22 January 2025
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