We study the signatures of topological light confinement in the leakage radiation of two-dimensional topological photonic crystal cavities that feature the quantum spin Hall effect at telecom wavelengths. The mode profiles in real and momentum space are retrieved using far field imaging and Fourier spectropolarimetry. We examine the scaling behavior of mode spectra, observe band-inversion-induced confinement, and demonstrate hallmarks of topological protection in the loss rates, which are largely unaffected by cavity shape and size.

European Research Council (ERC) , The Netherlands Organisation for Scientific Research (NWO)
New York: IEEE
Photonic Forces

Barczyk, R., Parappurath, N., Arora, S., Bauer, T., Kuipers, K., & Verhagen, E. (2022). Topological Protection in Radiative Photonic Crystal Cavities. In 2022 16th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) (pp. X055–X057). doi:10.1109/Metamaterials54993.2022.9920849