Data underlying the publication and chapter 3: Breakdown of spin-to-helicity locking at the nanoscale in topological photonic crystal edge states

  • S. Arora (Creator)
  • T.A. Bauer (Kavli institute of nanoscience Delft) (Creator)
  • R.T. Barczyk (AMOLF) (Creator)
  • E. Verhagen (Creator)
  • L. Kuipers (Creator)

Dataset

Description

We measure the local near-field spin in topological edge state waveguides that emulate the quantum spin Hall effect. We reveal a highly structured spin density distribution that is not linked to a unique pseudospin value. From experimental near-field real-space maps and numerical calculations, we confirm that this local structure is essential in understanding the properties of optical edge states and light-matter interactions. The global spin is reduced by a factor of 30 in the near field and, for certain frequencies, flipped compared to the pseudospin measured in the far field. We experimentally reveal the influence of higher-order Bloch harmonics in spin inhomogeneity, leading to a breakdown in the coupling between local helicity and global spin.
Date made available24 Jul 2023
PublisherTU Delft - 4TU.ResearchData
Date of data production2023 -

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