title: 256 × 256 liquid-crystal-on-silicon spatial light modulator.
abstract: A 256 × 256 pixel spatial light modulator (SLM) is designed and constructed by the use of liquid-crystalon-silicon technology. The device is a binary electrically addressed SLM with a measured zero-order contrast ratio of 70:1 and an imaged contrast ratio of 10:1. The pixel pitch is 21.6 µm, which gives an array size of 5.53 mm. The electronic load time is 43 µs, and the 10%-90% switching time of the liquid crystal is ~75-80 µs at room temperature, which implies a maximum frame rate of ~8.3 kHz. We discuss the design trade-offs that are intrinsic to this type of device and describe how the primary application for the device in an optical correlator influenced the final design.
authors.forename: D J
authors.initials: DJ
authors.lastname: McKnight
authors.forename: K M
authors.initials: KM
authors.lastname: Johnson
authors.forename: R A
authors.initials: RA
authors.lastname: Serati