Physical Review A
Electromagnetic-induced transparency and amplification of electromagnetic waves in photonic band-gap materials
Yuri V. Rostovtsev, Andrey B. Matsko, Marlan O. Scully
Abstract
We investigate the propagation of an electromagnetic (EM) wave in a heterostructure formed by spatially modulated density of $\ensuremath{\Lambda}$ three-level atoms. A new regime of propagation and amplification of EM waves with frequencies lying in the forbidden frequency range is found. An application of this phenomenon is discussed.