Abstract

In this paper we present calculations of level populations and susceptibility for an ensembleof five-level atoms doped in a photonic crystal, using the master equation method. Theatoms in the ensemble interact with the crystal which acts as a reservoir and are coupledwith two strong pump fields and a weak probe field. It is found that, by manipulating theresonance energy associated with one of the decay channels of the atom, the system can beswitched between an inverted and a non-inverted state. We have also observed theac Stark effect in these atoms and have shown that due to the role played bythe band structure of the photonic crystal, it is possible to switch between anabsorption state and a non-absorption state of the atomic system. This is a veryimportant finding as techniques of rendering material systems transparent to resonantlaser radiation are very desirable in the fabrication of novel optical and photonicdevices.

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