Pelekanos NT, Deveaud B, Gérard JM, Haas H, Strauss U, Rühle WW, Hebling J, Kuhl J. All-optical spatial light modulator with megahertz modulation rates.
OPTICS LETTERS 1995;
20:2099-2101. [PMID:
19862263 DOI:
10.1364/ol.20.002099]
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Abstract
We demonstrate a novel all-optical spatial light modulator capable of megahertz modulation rates. It is based on the quantum-confined Stark effect, but the modulating electric field is entirely photogenerated by strongly asymmetric photocarrier transfer in GaAs/AlAs layers. In a nonoptimized sample, cw optical excitation of approximately 50 W/cm(2) created a 30-kV/cm electric field, inducing a 9-meV exciton red shift at room temperature. Under pulsed excitation the photogenerated electric field can be switched on in a few tens of picoseconds and relaxes in a few hundred nanoseconds, permitting megahertz modulation rates.
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