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Proceedings Paper

Electromodulation and photomodulation spectroscopy of long-period doping superlattices
Author(s): Norbert Linder; W. El-Banna; Ulrich D. Keil; Klaus H. Schmidt; Gottfried H. Doehler; Jeffrey N. Miller; Karl Joachim Ebeling
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Paper Abstract

We performed room temperature photo- and electro-modulation measurements on MBE-grown GaAs pnp and pin structures with large layer thicknesses. In these crystals the optical properties are expected to be dominated by the local field-induced changes of the dielectric function rather than by subband-transitions. The dominating effect in the pnp-structure turns out to be the spatial dependence of the varying refractive index, resulting in a characteristic interference pattern. For the case of the pin structure we clearly observe Franz-Keldysh oscillations changing in amplitude and width with the internal field. Theoretical calculations using effective mass theory are in very good quantitative agreement with the experimental results. This agreement can be achieved only by the inclusion of excitonic effects in the calculation of the field-dependent absorption.

Paper Details

Date Published: 1 August 1990
PDF: 11 pages
Proc. SPIE 1286, Modulation Spectroscopy, (1 August 1990); doi: 10.1117/12.20865
Show Author Affiliations
Norbert Linder, Univ. of Erlangen-Nuernberg (Germany)
W. El-Banna, Univ. of Erlangen-Nuernberg (Germany)
Ulrich D. Keil, Univ. of Erlangen-Nuernberg (Denmark)
Klaus H. Schmidt, Univ. of Erlangen-Nuernberg (Germany)
Gottfried H. Doehler, Univ. of Erlangen-Nuernberg (Germany)
Jeffrey N. Miller, Hewlett-Packard Labs. (United States)
Karl Joachim Ebeling, Univ. of Braunschweig (Germany)

Published in SPIE Proceedings Vol. 1286:
Modulation Spectroscopy
Fred H. Pollak; Manuel Cardona; David E. Aspnes, Editor(s)

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