High-speed analog spatial light modulator using a hydrogenated amorphous silicon photosensor and an electroclinic liquid crystal Academic Article uri icon


  • A high‐speed optically addressed spatial light modulator is described which uses the electroclinic effect in chiral smectic A liquid crystals with ap‐i‐n photodiode of hydrogenated amorphous silicon (a‐Si: H). The near microsecond response time is a function of the liquid‐ crystal mixture and temperature. We present and analyze optical modulation measurements of a device which exhibits a response time of 40 μs at 29° C and 4 μs at 50° C. The optical response is continuous and linear with electric field and write‐light intensity, allowing for grey level applications.

publication date

  • January 1, 1989