Abstract:
:8-band k · p Hamiltonian together with envelope function approximation and planewave expansion method are applied to calculate the electronic band structure and material gain for Ge1-wSnw/SiyGe1-x-ySnx/Ge1-wSnw quantum wells (QWs) grown on virtual Ge1-zSnz substrates integrated with Si platform. It is clearly shown how both the emission wavelength in this material system can be controlled by the content of virtual substrate and the polarization of emitted light can be controlled via the built-in strain. In order to systematically demonstrate these possibilities, the transverse electric (TE) and transverse magnetic (TM) modes of material gain, and hence the polarization degree, are calculated for Ge1-wSnw/SiyGe1-x-ySnx/Ge1-wSnw (QWs) with the strain varying from tensile (ε = +1.5%) to compressive (ε = -0.9%). It has been predicted that the polarization can be changed from 100% TE to 80% TM. In addition, it has been shown that SiyGe1-x-ySnx barriers, lattice matched to the virtual Ge1-zSnz substrate (condition: y = 3.66(x-z)), may ensure a respectable quantum confinement for electrons and holes in this system. With such material features Ge1-wSnw/SiyGe1-x-ySnx/Ge1-wSnw QW structure unified with Ge1-zSnz/Si platform may be considered as a very prospective one for light polarization engineering.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Mączko HS,Kudrawiec R,Gladysiewicz Mdoi
10.1038/s41598-019-40146-zsubject
Has Abstractpub_date
2019-03-01 00:00:00pages
3316issue
1issn
2045-2322pii
10.1038/s41598-019-40146-zjournal_volume
9pub_type
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