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Photoreflectance study of Al<sub>0.45</sub>Ga<sub>0.55</sub>As/GaAs superlattice: optical transitions at the miniband <em>Γ</em> and <em>Π</em> points

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Author(s): Marcin Motyka | Grzegorz Sek | Filip Janiak | Krzysztof Ryczko | Jan Misiewicz | Kamil Kosiel | Maciej Bugajski

Journal: Optica Applicata
ISSN 0078-5466

Volume: 39;
Issue: 4;
Start page: 897;
Date: 2009;
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Keywords: superlattice | photoreflectance | modulation spectroscopy

ABSTRACT
In this paper, we present the results of photoreflectance (PR) investigation of an Al0.45Ga0.55As/GaAs superlattice (SL). The modulation spectra have revealed a number of features at both room and low temperature (10 K) which could be associated with the optical transitions between the minibands of the superlattice. Based on calculations within the effective mass approximation they have been identified as transitions between the miniband edges, i.e., the so-called Γ and Π points, respectively, including the high index transitions and those related to the light holes. Tuning the structure parameters around the nominal ones treated as semi-free in the theoretical considerations allowed the growth accuracy of such a complex system to be verified.
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Tango Jona
Tangokurs Rapperswil-Jona