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Published online by Cambridge University Press: 15 July 2004
The in-plane optical anisotropy of several GaAs/AlGaAs quantum well samples
with different well widths has been measured at room temperature by
reflectance-difference spectroscopy (RDS). The RDS line shapes are found to
be similar in all the samples examined here, which dominantly consist of
two peak-like signals corresponding to 1HH$\rightarrow$1E and
1LH$\rightarrow$
1E transition. As the well width is decreased, or the 1 ML
InAs layer is inserted at one interface, the intensity of the anisotropy
increases quickly. Our detail analysis shows that the anisotropy mainly arises
from the anisotropic interface roughness. The results demonstrate that the
RDS technique is sensitive to the interface structures.