With phase- and polarization-resolving near-field optical microscopy we directly visualize the electromagnetic vector field in topological photonic crystals featuring the optical quantum spin Hall effect. We reveal that the local optical spin of spin-protected edge states is highly structured.

OSA Technical Digest
Photonic Forces

Arora, S, Bauer, T, Barczyk, R, Verhagen, E, & Kuipers, L. (2020). Measuring Optical Spin in the Near Field of Photonic Topological Edge States. In Conference on Lasers and Electro-Optics, paper FM2B.3. OSA Technical Digest. doi:10.1364/CLEO_QELS.2020.FM2B.3