We directly observe the states of topological photonic crystals at telecom wavelengths. Using the states’ intrinsic radiation, we measure dispersion, loss, pseudospin, and spin-spin scattering. We image spin-selective unidirectional propagation around sharp corners and junctions.

Photonic Forces

Parappurath, N., Alpeggiani, F., Kuipers, K., & Verhagen, E. (2019). Direct Observation of Topological Edge States in Silicon Photonic Crystals. In CLEO: Applications and Technology, paper JM2B. 2. doi:10.1364/CLEO_AT.2019.JM2B.2