There is a newly published publication by members of the ZOTERAC consortium: "Breaking the Intersubband Selection Rules for Absorption with ZnO Quantum Wells: Light Polarization Sensitivity under Normal Incidence", by Montes Bajo et al.
Here we demonstrate how the morphology of the m-plane ZnO/MgZnO quantum wells allows for the intersubband absorption of light even at normal incidence (usually forbidden by the selection rules) with sensitivity to the polarization of the light with respect to the c axis of the crystal. It can be read here.
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(a) Cross-sectional HRTEM image of sample B. (b) Schematic describing the proposed mechanism by which polarization-sensitive, normal-incidence ISB absorption is allowed in m-plane ZnO/(Mg,Zn)O QWs. ϕ is the angle between the QW interface and the growth plane. From Montes Bajo et al., Phys. Rev. Applied 10, 034022 (2018) |
