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We propose and analyze an efficient scheme for suppressing the absorption ofa weak probe field based on intersubband transitions in a four-level asymmetriccoupled-quantum well (CQW) driven coherently by a probe laser field and acontrol laser field. By using the numerical simulation, we find that themagnitude of the transient absorption of the probe field is smaller than thethree-level system based on the electromagnetically induced transparency (EIT)at line center of the probe transition, moreover, comparing with the scheme inthree-level asymmetric double QW system, the transparency hole of the presentwork is much broader. By analyzing the steady-state process analytically andnumerically, our results show that the probe absorption can be completelyeliminated under the condition of Raman resonance (i.e. two-photon detuning iszero). Besides, we can observe one transparency window without requiring one-or two-photon detuning exactly vanish. This investigation may provide thepossible scheme for EIT in solids by using CQW.

Suppression of absorption by quantum interference in intersubband transitions of tunnel-coupled double quantum wells