TY - DATA
T1 - Data underlying the publication and chapter 3: Breakdown of spin-to-helicity locking at the nanoscale in topological photonic crystal edge states
PY - 2023/07/24
AU - Sonakshi Arora
AU - Thomas Bauer
AU - René Barczyk
AU - Ewold Verhagen
AU - L. (Kobus) Kuipers
UR - https://data.4tu.nl/articles/dataset/_/18779327
DO - 10.4121/18779327.v1
KW - Spin density maps
KW - dispersion relation
KW - SNOM tip
KW - silicon-on-insulator waveguide structure
KW - topological waveguides
N2 - <p>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.</p>
ER -