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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 11, Iss. 10 — Oct. 1, 1972
  • pp: 2223–2227

Optical Pattern Processing Utilizing Nematic Liquid Crystals

Seiji Inokuchi, Yasuji Morita, and Yoshifumi Sakurai  »View Author Affiliations


Applied Optics, Vol. 11, Issue 10, pp. 2223-2227 (1972)
http://dx.doi.org/10.1364/AO.11.002223


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Abstract

This paper describes a new type of optical processing based on the dynamic scattering effect in liquid crystals. It is possible to realize a binary spatial filter with nematic liquid crystals and to control the optical modes by voltage signals. A two-dimensional Walsh function is used for extracting properties of the input patterns. The realization of an 8 × 8 Walsh function filter with nematic liquid crystals is demonstrated. The contrast ratio is over 30 to 1. The variation in transparency is within ±3%. Experimental results show that it is possible to extract the properties of handwritten characters by detecting the intensity of light transmitted through both the input pattern and the liquid crystal filter.

© 1972 Optical Society of America

History
Original Manuscript: August 9, 1971
Published: October 1, 1972

Citation
Seiji Inokuchi, Yasuji Morita, and Yoshifumi Sakurai, "Optical Pattern Processing Utilizing Nematic Liquid Crystals," Appl. Opt. 11, 2223-2227 (1972)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-11-10-2223


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References

  1. H. F. Harmuth, Transmission of Information by Orthogonal Functions (Springer-Verlag, Berlin, 1969). [CrossRef]
  2. J. A. Decker, Appl. Opt. 9, 1392 (1970). [CrossRef] [PubMed]
  3. A. N. Mucciadri, E. E. Gose, IEEE Trans. EC-15, 257 (1966).
  4. W. K. Pratt et al., Proc. IEEE 57, 58 (1969). [CrossRef]
  5. G. H. Heilmeier et al., Proc. IEEE 56, 1162 (1968). [CrossRef]
  6. J. A. Van Raalte, Proc. IEEE 56, 2146 (1968). [CrossRef]
  7. R. A. Soref, Appl. Opt. 9, 1323 (1970). [CrossRef] [PubMed]

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