High contrast ratio InxGa1-xAs/GaAs multiple-quantum-well spatial light modulators

Alex Harwit; Mr. Rowell Fernandez; Wendell D. Eades

doi:10.1117/12.49317

1 November 1991 High contrast ratio In_xGa_1-xAs/GaAs multiple-quantum-well spatial light modulators

Alex Harwit, Mr. Rowell Fernandez, Wendell D. Eades

Proceedings Volume 1541, Infrared Sensors: Detectors, Electronics, and Signal Processing; (1991) https://doi.org/10.1117/12.49317
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

We report optical modulation results on InGaAs/GaAs coupled multiple quantum well spatial light modulators. The structures consist of an n+ GaAs buffer, an undoped 250 period coupled multiple quantum well layer, and a p+ GaAs/InAs cap. The samples are probed at room temperature using photoabsorption spectroscopy. An absorption peak is observed at 969 nm, and this shifts to 982 nm as the field is increased from 0 to 67 kV/cm, in good agreement with theory. For a single pass through the structure, this results in a contrast ratio > 8:1 at 969 nm. A second modulator exhibits a contrast ratio > 8:1 at 1.04 micrometers .

Citation Download Citation

Alex Harwit, Mr. Rowell Fernandez, and Wendell D. Eades "High contrast ratio In_xGa_1-xAs/GaAs multiple-quantum-well spatial light modulators", Proc. SPIE 1541, Infrared Sensors: Detectors, Electronics, and Signal Processing, (1 November 1991); https://doi.org/10.1117/12.49317

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