Spontaneous Emission Spectrum of a Λ-Typed Atom in a Coherent Photonic Reservoir

The spontaneous emission of a three-level Λ−typed atom embedded in anisotropic photonic crystals with two coherent bands is investigated. The relative position of the atom is described by a position-dependent parameter θ(r₀), in regard as the coherence of the two bands. The spectrum of the transition in free space vacuum is discussed. The spectral center can be manipulated by the coherent parameter θ(r₀), and the spectral intensity can be adjusted via the atomic transition in the coherent photonic reservoir.