Chiral Optical Properties of Plasmonic Kagome Lattices

Xitlali G. Juarez, Francisco Freire-Fernández, Siamak Khorasani, Marc R. Bourgeois, Yi Wang, David J. Masiello, George C. Schatz, Teri W. Odom*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Kagome lattices can be considered hexagonal lattices with a three-nanoparticle unit cell whose symmetry may lead to the formation of higher-order topological states. This work reports the emergence of polarization-dependent features in the optical band structures of plasmonic Kagome lattices through lattice engineering. By expanding the separations between particles in a unit cell while preserving lattice spacing, we observed additional modes at the K-points of aluminum nanoparticle Kagome lattices. As the rotational symmetry was reduced from 6- to 3-fold, a splitting at the K-point was observed as well as the presence of an additional surface lattice resonance (SLR) band under linear polarization. This SLR band also exhibited a chiral response that depended on the direction of circularly polarized light and resulted in asymmetry in the optical band structure. The polarization-dependent response of plasmonic Kagome lattices can inform the design of systems that support topological states at visible wavelengths.

Original languageEnglish (US)
Pages (from-to)673-681
Number of pages9
JournalACS Photonics
Volume11
Issue number2
DOIs
StatePublished - Feb 21 2024

Keywords

  • Kagome lattice
  • circularly polarized light
  • lattice plasmons
  • plasmonic nanoparticle lattice
  • surface lattice resonance
  • topological photonics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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