This article is cited in 1 paper

XVI Symposium "Nanophysics and Nanoelectronics", Nizhni Novgorod, March 12-16, 2012

Study of methods for lowering the lasing frequency of a terahertz quantum-cascade laser based on two quantum wells

D. V. Ushakov^a, Yu. G. Sadof'ev^b, N. Samal<sup>c

a</sup> Belarusian State University, Minsk
^b P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow
^c Trion Technology, 85281 Tempe, AZ, USA

Abstract: Two mechanisms for achieving lower terahertz-range frequencies in quantum-cascade structures with two quantum wells based on GaAs/AlGaAs compounds are proposed. The first mechanism is based on the introduction of composite quantum wells consisting of a narrow ($\sim$2 nm) quantum well with a low potential barrier, being within the main wide quantum well. The second mechanism is based on barriers with unequal heights, arranged in front of and behind the composite quantum well. Optimized quantum-cascade laser structures emitting in the regions of $\sim$2.15 and $\sim$1.35 THz are calculated.

Received: 25.04.2012
Accepted: 25.04.2012

 English version: Semiconductors, 2012, 46:11, 1402–1406

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