As it has previously been demonstrated the novel quasi 0D structures called quantum dashes, which are strongly elongated dots or finite size quantum wires in shape, present a potential in a number of optoelectronic applications, in the near infrared especially, due their intrinsic properties like naturally high surface density or wide emission wavelength tunability [1-2]. However, the electronic structure of the dashes needs deeper understanding yet, as many of the optical properties are still unclear, e.g. the interpretation of the optical transitions or the importance of the largest size confinement.

We have calculated the electronic states and optical transitions exploiting the model of the two dimensional quantum confinement (wire-like approach). We have used the adiabatic approximation within the effective-mass theory to calculate the states of a quantum dash with different cross-section, like rectangular or triangular. The model takes into account the realistic dash crystallographic orientation, its shape, material composition and strain distribution. The model has been applied for the dashes in two different material systems: AlGaAs-GaAs and InGaAlAs-InP. We have calculated the confined states energies of the dashes versus their lateral size following the existing structural data and compared them to the experimentally determined optical transition energies.

Further, we have calculated the electronic structure for a pair of quantum dashes in order to probe the quantum-mechanical coupling effects. We have calculated the energies of confined states as a function of base dash width and the distance between quantum dashes.

1. R. Schwertberger, D. Gold, J. P. Reithmaier, A. Forchel, IEEE Photonics Technology Letters 14, 735 (2002).
2. A. Bilenca, R. Alizon, V. Mikhelashvili, G. Eisenstein, R. Schwertberger, D. Gold, J. P. Reithmaier, A. Forchel, Electonics Letters 39, 170 (2003).

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