Low Index Contrast Valley Hall Topological Photonics for Robust Transport in the Visible Spectrum

Pufan Liu, Hongfei Zeng, David A. Czaplewski, Nathaniel P. Stern*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Topological photonics is an emerging platform to study light-matter interactions with promising features such as robust edge state transmission that could be advantageous for quantum information applications. However, applying common topological photonic designs for visible wavelength light-matter interactions is challenging because materials compatible with the visible spectrum have lower refractive index contrasts. We design and demonstrate a novel valley Hall topological photonic crystal that can support a complete topological band gap in the visible spectrum. We also show an overetch procedure can be used to reduce the leakage loss common for low index contrast materials. To demonstrate these advantages, we fabricate topological photonic devices following these design principles and show that edge states at energies in the complete band gap have robust transmission around sharp corners. The compatibility of this photonic structure with straightforward fabrication methods will facilitate the study of interactions between topologically nontrivial photons and nanomaterials active in the visible spectrum.

Original languageEnglish (US)
Pages (from-to)922-928
Number of pages7
JournalACS Photonics
Issue number3
StatePublished - Mar 16 2022


  • edge states
  • nanophotonics
  • photonic crystal
  • topological photonics
  • valley Hall

ASJC Scopus subject areas

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


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