Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Elementary Excitations II: Pair and Collective Excitations
Abstract Optical spectroscopies are emerging as particularly promising tools to probe surfaces, since they allow for in situ, non-destructive and real-time monitoring under challenging conditions as may be encountered, for instance, during epitaxial growth. For epitaxial growth by means of chemical reactions, such as, e.g., metal-organic chemical vapor deposition (MOCVD), optical spectroscopies provide the only possibility for such monitoring. Other advantages are that the material damage and contamination associated with charged particle beams are avoided. Insulators can be studied without the problem of charging effects, and buried interfaces are accessible owing to the large penetration depth of the electromagnetic radiation. Optical techniques offer micron lateral spatial resolution and femtosecond temporal resolution. However, since light penetration and wavelength are much larger than surface thicknesses (a few Å), such techniques are actually poorly sensitive to surfaces. Some “tricks” have to be employed in order to increase their surface sensitivity. The experimental progress in the characterization of surfaces using light has been summarized in a couple of excellent reviews and monographs [6.1–6.5]. Theoretical considerations can be found in review articles by R. Del Sole [6.6,6.7].
Elementary Excitations II: Pair and Collective Excitations
Abstract Optical spectroscopies are emerging as particularly promising tools to probe surfaces, since they allow for in situ, non-destructive and real-time monitoring under challenging conditions as may be encountered, for instance, during epitaxial growth. For epitaxial growth by means of chemical reactions, such as, e.g., metal-organic chemical vapor deposition (MOCVD), optical spectroscopies provide the only possibility for such monitoring. Other advantages are that the material damage and contamination associated with charged particle beams are avoided. Insulators can be studied without the problem of charging effects, and buried interfaces are accessible owing to the large penetration depth of the electromagnetic radiation. Optical techniques offer micron lateral spatial resolution and femtosecond temporal resolution. However, since light penetration and wavelength are much larger than surface thicknesses (a few Å), such techniques are actually poorly sensitive to surfaces. Some “tricks” have to be employed in order to increase their surface sensitivity. The experimental progress in the characterization of surfaces using light has been summarized in a couple of excellent reviews and monographs [6.1–6.5]. Theoretical considerations can be found in review articles by R. Del Sole [6.6,6.7].
Elementary Excitations II: Pair and Collective Excitations
Professor Dr. Bechstedt, Friedhelm (Autor:in)
01.01.2003
56 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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