A light beam reflected and refracted at a sharp interface can acquire a momentum-dependent Pancharatnam-Berry (PB) phase, which produces a topological phase transition from one kind of spin-orbit interaction (e.g., spin-controlled vortex generation) to another (e.g., photonic spin-Hall effect). However, this process is extremely inefficient and difficult to observe directly in experiments, which also hinders its applications. Here, we propose to enhance significantly the topological phase transitions by c-cut uniaxial crystals. We first give a ...
