Abstract:We investigate the use of intersubband transitions between two weakly coupled shallow quantum wells to generate terahertz radiation. The wells are designed for independent contacting and biasing. The maximum gain ͑absorption͒ scales with the wavefunction overlap and difference between the well carrier densities. The absorption line shape is studied taking into account the interplay between inhomogeneous and homogeneous broadening mechanisms, including both large-scale variations in the coupled levels and also … Show more
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