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We study the absorption and dispersion properties of a {Λ}-type atom that decays spontaneously near the edge of a photonic band gap (PBG). Using an isotropic PBG model, we show that the atom can become transparent to a probe laser field, even when other dissipative channels are present. This transparency originates from the square-root singularity of the density of modes of the PBG material at threshold.
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Paspalakis et al. (1999) studied this question.
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