Abstract
We investigate the dispersive property of a Λ-type atomic system embeddedin photonic band gap structures. The atomic coherence is established bythe structured reservoir which consists of a double-band photonic bandgap (PBG) and defect modes. With an atomic density of 7×1015 atoms/cm3, the group velocity of a probe laser being detunedfar away from the gap is shown to be reduced to 3×102 m/s nearthe transparency window associated with the PBG edges and 6×103 m/s at the transparency window associated with the defect modes,without using any deriving field. The influence of the smoothness ofthe density of modes and the decay rate of the second ground state ofatoms are analysed.
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