High Efficiency Four-Wave Mixing with Relaxation Coupling of Longitude-Optical Phonons in Semiconductor Quantum Wells*

Abstract

The time-dependent analysis of four-wave mixing (FWM) has been performed in four-level double semiconductor quantum wells (SQWs) considering the cross-coupling of the longitude-optical phonons (LOP) relaxation. It is shown that both the amplitude and the conversion efficiency of the FWM field enhance greatly with the increasing strength of cross-coupling of LOP relaxation. Interestingly, a double peak value of the conversion efficiency is obtained under a relatively weak single-photon detuning considering the LOP coupling. When the detuning becomes stronger, the double peaks turn into one peak appearing at the line respect to the about equality two control fields. The results can be interpreted by the effect of electromagnetically induced transparency and the indirect transition. Such controlled high efficiency FWM based on the cross-coupling LOP may have potential applications in quantum control and communications.

Tunneling-induced highly efficient four-wave mixing in asymmetric double quantum wells

“…In recent years, with the emergence of new mat erials, i.e. quantum wells (QWs) [15][16][17][18][19][20][21][22][23] and graphene [26,27], researchers have paid much attention to the FWM process in these materials because of their excellent properties. Especially, semiconductor QW structures have large electric dipole moments, small effective electric mass, and highly nonlinear optical coefficients in comparison to atomic systems.…”

“…What is more, the dipole moments, the intersubband energies, and the electron function symmetries can be flexibly designed by choosing the materials and structural dimensions in QWs. To date, there have been many reports in the literature of the FWM process in semiconductor QW structures [15][16][17][18][19][20][21][22][23]. Hao et al firstly proposed an FWM scheme in an asymmetric semiconductor double QW structure based on intersubband transitions [15], and the maximum FWM conversion efficiency of the system that could be obtained was greater than 25% under the resonant and phase-matched conditions.…”