Abstract

As nanotechnology becomes more developed, the nanostructures being fabricated become more complex, with complicated geometries and strong coupling between structures. Wegscheider et al.¹ have shown that T-shaped quantum wires at intersections of quantum wells formed by cleaved edge overgrowth (see Fig. 1) exhibit stimulated emission; these nanostructures are the first to lase from the exciton state. More recently, Pfeiffer et al.² studied strongly coupled T-shaped wires formed by cleaved edge growth on double-well systems. Complex multilayer quantum-dot structures (see Fig. 1), called quantum-dot quantum wells, in analogy with quantum-well structures, are also now being fabricated.^3,4

© 1995 Optical Society of America