Surface waves and volume waves in a photonic crystal slab

The volume and surface waves supported by a 2D PC slab with termination condition are systematically studied using the rigorous modematching method incorporating the Floquet's solutions. It is interesting to observe that the surface waves are caused by the perturbation of the PC-slab modes from the imposed termination condition, enabling the transition from volume wave to surface wave. The perturbed dispersion curves and electric field strength distribution over the structure are drawn together with the unperturbed ones (without termination condition) to identify the type of bound waves.