Electromodulation and photomodulation spectroscopy of long-period doping superlattices

Norbert Linder; W. El-Banna; Ulrich D. Keil; Klaus H. Schmidt; Gottfried H. Doehler; Jeffrey N. Miller; Karl Joachim Ebeling

doi:10.1117/12.20865

1 August 1990 Electromodulation and photomodulation spectroscopy of long-period doping superlattices

Norbert Linder, W. El-Banna, Ulrich D. Keil, Klaus H. Schmidt, Gottfried H. Doehler, Jeffrey N. Miller, Karl Joachim Ebeling

Author Affiliations +

Proceedings Volume 1286, Modulation Spectroscopy; (1990) https://doi.org/10.1117/12.20865
Event: Advances in Semiconductors and Superconductors: Physics Toward Devices Applications, 1990, San Diego, CA, United States

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.

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Norbert Linder, W. El-Banna, Ulrich D. Keil, Klaus H. Schmidt, Gottfried H. Doehler, Jeffrey N. Miller, and Karl Joachim Ebeling "Electromodulation and photomodulation spectroscopy of long-period doping superlattices", Proc. SPIE 1286, Modulation Spectroscopy, (1 August 1990); https://doi.org/10.1117/12.20865

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