All-Optical Spatial Light-Modulator with Megahertz Modulation Rates

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. (C) 1995 Optical Society of America


Published in:
Optics Letters, 20, 20, 2099-2101
Year:
1995
ISSN:
0146-9592
Keywords:
Note:
Max planck inst festkorperforsch,d-70569 stuttgart,germany. ecole polytech fed lausanne,phb ecublens,ch-1015 lausanne,switzerland. cnet bagneux,france telecom,bagneux,france. Pelekanos, nt, cea,dept rech fondamentalle mat condensee,sp2m,psc,17 rue martyrs,f-38054 grenoble,france.
ISI Document Delivery No.: RY840
Times Cited: 2
Cited Reference Count: 13
Cited References:
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