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- W2014678811 abstract "In this paper we report novel high contrast, high reflectivity n+-AlGaAs/GaAsAl/Ag asymmetric Fabry-Perot (ASFP) optical modulators and self-electro-optic devices (SEED) using the Franz-Keldysh (FK) electroabsorption in bulk GaAlAs layer. These modulators exhibit `normally off' and `normally on' optical modulation at and below the band edge with contrast ratios in the range of 25:1 to 200:1 and reflectivities of about 30% to 50%. We show that our experimental data is consistent with a model of electroabsorption that includes unbound excitons. The FK-SEED, exhibiting contrast rations of approximately 90:1 and reflectivities of 27% at 11 V, operates based on the combined effects of negative electroabsorption and the `normally off' properties of the device. In addition to these devices operating in the 10 nm vicinity of the GaAs band gap (872 nm), we also report a high contrast modulator with Ga0.975Al0.025As FK layer operating at the standard 850 nm wavelength. These devices demonstrate the feasibility of using the bulk Franz-Keldysh effect as an alternative to quantum confined stark effects (QCSE) for efficient optical switching and modulation for many applications.© (1994) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only." @default.
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- W2014678811 date "1994-05-11" @default.
- W2014678811 modified "2023-09-23" @default.
- W2014678811 title "<title>Optical modulation and bistability using bulk Franz-Keldysh effect in GaAlAs-GaAsAg asymmetric Fabry-Perot device structures</title>" @default.
- W2014678811 doi "https://doi.org/10.1117/12.175698" @default.
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