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doi: 10.4121/18779327

Arora, Sonakshi; Bauer, Thomas; Barczyk, René; Verhagen, Ewold; Kuipers, L. (Kobus) (2023): Data underlying the publication and chapter 3: Breakdown of spin-to-helicity locking at the nanoscale in topological photonic crystal edge states. Version 1. 4TU.ResearchData. dataset. https://doi.org/10.4121/18779327.v1

Dataset

• Optical Physics
• Physical Sciences

dispersion relation, silicon-on-insulator waveguide structure, SNOM tip, Spin density maps, topological waveguides

CC0

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by Sonakshi Arora , Thomas Bauer , René Barczyk , Ewold Verhagen , L. (Kobus) Kuipers

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.

• 2023-07-24 first online, published, posted

4TU.ResearchData

*.py and *.npz files

Breakdown of Spin-to-Helicity Locking at the Nanoscale in Topological Photonic Crystal Edge States

Kavli Institute of Nanoscience, Delft University of Technology