Elimination of the band gap of a resonant optical material by electromagnetically induced transparency
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چکیده
We consider the possibility of wave propagation in the normally disallowed ~band-gap! region of a resonant optical medium, that is, in the band of frequencies near resonance where the real part of the frequencydependent dielectric function is negative. We demonstrate that wave propagation can become allowed by the application of a strong electromagnetic field resonant with some additional transition of the material system. The frequencies at which these effects can occur are strongly influenced by local-field effects. @S1050-2947~99!51310-3#
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تاریخ انتشار 1999