Finite-Size Effect in the Photonic Topological System

Measurements of the transmission matrix of a topological system supporting edge state between metacrystal emulating quantum valley-Hall and spin-Hall effects show the disruption of ballistic propagation. We observe a decrease of transmission and an increasing of the dwell time for the edge mode in a finite topological system. The non-linear spatial decrease of the logarithm of the intensity along the edge highlights the differences between transport statistics of an edge state and normal 1D channel.