Abstract: Application of electric field to heterostructure p-n junctions beyond the threshold produces lasing. On further increase of the electric field the peak of the intensity shifts towards red. The line width also increases. In this article it is shown that this shift as well as the change in the line width can be effectively utilized to distinguish the 3D to 0D structures. The shift in the bulk structure exhibits F$+2/3$/ power law, where 'F' is the electric field, while 2D, 1D, and 0D samples give rise to a quadratic dependence as in single atoms. In addition elegant modifications in micro-fabricational techniques are suggested as to realize more efficient structures with ease. !40
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