Bistable spatial light modulator using guest-host liquid crystal and bi12GEO20photoconductive crystal

Hideo Fujikake, Kuniharu Takizawa, Hiroshi Kikuchi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


This paper describes a new bistable spatial light modulator consisting of a guest-host type of 90°-twisted nematic liquid crystal layer and a Bi12GeO20photoconductor. The optical bistability is generated by an internal electro-optic feedback effect based on the nonlinear transmittance property of the guest-host liquid crystal layer and the photoconductive property of the Bii2Ge02o crystal. This device has various optical threshold functions, where the optical threshold level is easily controlled by varying the drive voltage of the device or its frequency. Optical image binarization and optical parallel logic operations based on optical bistability are realized by illuminating the liquid crystal layer with blue light. It has a limiting resolution of 25 lp/mm, and the rise and decay times of the device are approximately 30 ms and 90 ms, respectively.

Original languageEnglish
Pages (from-to)842-848
Number of pages7
JournalJapanese journal of applied physics
Issue number8 R
Publication statusPublished - 1993 Feb
Externally publishedYes


  • BiGeOO crystal
  • Guest-host liquid crystal
  • Optical bistability
  • Optical image proc essing
  • Optical parallel logic operation
  • Spatial light modulator

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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