Research Article

Negative Propagation Effects in Two-Dimensional Silicon Photonic Crystals

Figure 7

The EFC of frequency . The air-PhC interface is normal to the Γ-M direction. is the incident angle of the plane wave. A Bloch wave denoted by A is excited in the PhC. is the group velocity of the Bloch wave, which has a refraction angle of against the normal of the interface.