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In this article, we use spatially modulated control fields to increase thefour-wave mixing efficiency in a four-subband semiconductor asymmetric doublequantum well, motivated by similar works in atomic systems. Using a simplifiedversion of the propagation equations, we show analytically that for controlfields with constant amplitude and linearly varying mixing angle with thepropagation distance, a conversion efficiency close to unity can be achievedeven for relatively short propagation distances. Subsequently, we confirm theseresults by numerically simulating the full set of propagation equations.

Efficient four-wave mixing in four-subband semiconductor quantum wells using spatially modulated control fields with a linearly varying mixing angle