Tunable mid-IR emission using a novel quantum dot–quantum well coupled system

Low-temperature photoluminescence studies of InSb/GaSb quantum dots strongly coupled to narrow InAs quantum wells are presented. Inclusion of the quantum well has enabled the dot emission energy to be reduced from 0.72 to View the MathML source. Four-band k.p calculations have been used to illustrate the proposed mechanism. In particular, the importance of the InAs well width and GaSb ‘spacer’ thickness is discussed in terms of the overall character of the coupled state and the relative intensity of the transition.