Optical anisotropy of Ge(001)2x1

Wentink, Derk Jan and Wormeester, Herbert and Boeij de, Paul and Wijers, Chris and Silfhout van, Arend (1992) Optical anisotropy of Ge(001)2x1. Surface Science, 274 (2). pp. 270-276. ISSN 0039-6028

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Abstract:	We have measured the change in the optical reflection anisotropy of a clean Ge(001) surface upon exposure to molecular oxygen up to saturation coverage. Both phase and amplitude changes have been recorded with a normal-incidence ellipsometer. They have been found to be related by a Kramers-Kronig transformation. The change in the complex reflection ratio could be interpreted as an anisotropy of the clean Ge(001)2 × 1 surface dielectric function, using a three-layer McIntyre-Aspnes approach and neglecting the oxygen overlayer. The surface dielectric function anisotropy can be described fairly well by optical selection rules, based on symmetry arguments. This model was applied to the possible optical transitions at this surface between filled dimers, dangling bonds and back-bonds and the empty dangling bonds and dimers.
Item Type:	Article
Copyright:	© 1992 Elsevier Science
Faculty:	Science and Technology (TNW)
Research Group:	Physics of Interfaces and Nanomaterials (PIN)
Link to this item:	http://purl.utwente.nl/publications/24071
Official URL:	http://dx.doi.org/10.1016/0039-6028(92)90531-A
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