Quantum-Dot Cascade Laser: Proposal for an Ultra-Low-Threshold Semiconductor Laser
Abstract
We propose a quantum-dot version of the quantum-well cascade laser of Faist et al. [Science 264, 553 (1994)]. The elimination of single phonon decays by the three-dimensional confinement implies a several order-of-magnitude reduction in the threshold current. The requirements on dot size (10-20nm) and on dot density and uniformity [one coupled pair of dots per (180nm)3 with 5% nonuniformity] are close to current technology.
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