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, K. (2020). Measuring Optical Spin in the Near Field of Photonic Topological Edge States. In Conference on Lasers and Electro-Optics, paper FM2B.3. doi:10.1364/CLEO_QELS.2020.FM2B.3