The effect of layer’s thickness on the optical response of superlattices

We apply the Theory of Finite Periodic Systems to study the photoluminescent behavior of superlattices. Using this formalism, where intra-subband energy levels are neatly identified, we study the optical response for different barrier and well thicknesses, and show that this quantity is very sensitive to small changes in the superlattice parameters. Varying the barrier thickness (for fixed well-width), or the well-width (for constant barrier thickness), the intensities of the relevant PL-peaks change drastically. We make clear also that this highly accurate formalism can be used to design optimal superlattice-optoelectronic devices.