Intersubband optical absorption in ZnO/MgZnO triple quantum well structures

The linear intersubband optical absorption spectra in MgZnO/ZnO triple quantum wells (TQWs) are theoretically calculated with various geometrical structures and material compositions. Mg composition is found to have remarkable effects on peak position and magnitude of linear optical absorption spectra (OAS). The width of the potential well in which subband 1 is located can also significantly influence the linear OAS, but there is no influence found from the variation of other potential well width and barrier thickness. On the other hand, the effect of electric field transversely applied across MgZnO/ZnO TQWs on the energy of subbands and OAS are analyzed. This study suggests several methods to obtain tunable intersubband optical absorption in MgZnO/ZnO TQWs which can be potentially used as infrared detector devices.

Automated summary

The linear intersubband optical absorption spectra in MgZnO/ZnO triple quantum wells are calculated with various geometrical structures and material compositions. The effects of Mg composition and potential well width on the spectra are found, and methods for obtaining tunable optical absorption are suggested.