Fig. 4From: Spontaneous emission in micro- or nanophotonic structuresThe basic concepts of PCs. a A schematic diagram of a 2D PC slab [102]. b A schematic diagram of 3D PC [103]. c A photonic band diagram of a 2D PC slab [104]. d The electric field in a L3 cavity by shifting the holes at the cavity edges [12]. e The electric field of a double heterostructure PC waveguide [105]Back to article page