The effects of sample imperfections on optical spectra

The results of the theory of light reflection from rough surfaces have been extended to cover the case of light transmission through a sample with rough surfaces, as well as reflection and transmission for inhomogeneous samples. A concept of “Inhomogeneity Induced Roughness” of the constant phase plane has been introduced to describe the specular reflection from inhomogeneous media. The drastic influence of the multiple scattering effect on the optical spectra has been demonstrated for a simple model. The generalized formulae for reflection and transmission of light for imperfect samples are given. Finally, several peculiar experimental observations concerning exciton spectra in II–VI compounds, light scattering at the plasma frequency in metals, electroreflection, and other effects are discussed. Die Theorie der Lichtreflexion an rauhen Oberflachen wird fur den Fall der Lichttransmission durch eine Probe mit rauhen Oberflachen sowie der Reflexion und Transmission von nicht homogenen Proben erweitert. Der Begriff einer „Rauhheit durch Inhomogenitat” der konstanten Phasenflache wird eingefuhrt, um die Spiegelung an nichthomogenen Medien zu beschreiben. Der drastische Einflus der Vielfachstreuung auf die optischen Spektren wird an einem einfachen Modell erlautert. Es wird eine verallgemeinerte Formel fur die Reflexion und Transmission von Licht an unvollkommenen Proben angegeben. Gestutzt auf diese Vorstellungen wird eine Erklarung vorgeschlagen, um verschiedene, spezielle, experimentelle Beobachtungen auf dem Gebiet der Exzitonspektren von II–VI-Verbindungen, Lichtstreuung bei der Plasmafrequenz in Metallen, Elektroreflexion und anderer Effekte zu erklaren.

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