A spatial light modulator with a thin (1-µm) amorphous silicon (PIN) photoconductor has been demonstrated with a threshold sensitivity of <3 µw/cm2. A novel compound electrode design greatly increases the efficiency allowing the use of a photoconductive layer thin enough to achieve good transmission. The performance characteristics are reported and compared to the predictions of a theoretical model of the device.
Paul R. Ashley, Jack H. Davis, and Tae Kwan Oh, "Liquid crystal spatial light modulator with a transmissive amorphous silicon photoconductor," Appl. Opt. 27, 1797-1802 (1988)