Dual-channel Dirac-vortex topological cavity in hexagon photonic crystal

Multiplexing techniques have always been one of the important components of optical communication research. These techniques can transmit multiple signals in a shared information channel and can greatly increase the maximum capacity of an information channel. The Dirac-vortex cavity is a type of photonic crystal surface emission system, and its characteristics of miniaturization and high stability make it very suitable for on-chip optical system. In this paper, we realized dual-channel emission of the Dirac-vortex cavity, which is achieved by modulating the size and phase of hexagonal holes in the hexagon lattice. The characteristics of dual-channel emission are investigated by numerical simulation, and the dual-channel emission rules are summarized. The double Dirac-vortex cavity model is not only explored for its multiplexing capability but also as an alternative scheme for the application of Dirac-vortex cavity in multiplex communication systems.