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Effects of position and density distribution of atoms on spontaneous emission (SE) from excited two-level atoms in an anisotropic and two-band photonic crystal (PC) are investigated. By considering these atoms with a Gaussian distribution in the PC, which acts as a coherent photonic-band-gap reservoir, we find that a photon-atom bound state occurring in the single-band model becomes a decay state...
The optical spectra of a three-level atom embedded in a photonic crystal is studied by considering the coherent two-band photonic reservoir. We find that the spectrum is shifting with respect to the atomic position.
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