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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 34, Iss. 31 — Nov. 1, 1995
  • pp: 7221–7227

Liquid-crystal-based switchable polarizers for sensor protection

Chiung-Sheng Wu and Shin-Tson Wu  »View Author Affiliations


Applied Optics, Vol. 34, Issue 31, pp. 7221-7227 (1995)
http://dx.doi.org/10.1364/AO.34.007221


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Abstract

Linear polarizers are generally employed in conjunction with advanced liquid-crystal filters for the protection of human eyes and optical sensors. For detection sensitivity under a no-threat condition to be maximized, the polarizer should remain in a clear state with a minimum insertion loss. When threats are present, it should be quickly switched to function as a linear polarizer with a high extinction ratio. Two types of switchable polarizer for sensor protection are demonstrated. The polarization conversion type exhibits a high optical efficiency in its clear state, a high extinction ratio in the linear polarizer state, and a fast switching speed, except that its field of view is limited to approximately ±10°. In contrast, an improved switchable dichroic polarizer functions effectively over a much wider field of view. However, its extinction ratio and optical efficiency in its clear state are lower than those of the polarization conversion type.

© 1995 Optical Society of America

History
Original Manuscript: February 21, 1995
Revised Manuscript: April 21, 1995
Published: November 1, 1995

Citation
Chiung-Sheng Wu and Shin-Tson Wu, "Liquid-crystal-based switchable polarizers for sensor protection," Appl. Opt. 34, 7221-7227 (1995)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-34-31-7221


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References

  1. See, e.g., many of the review papers in the special issue of the International Journal of Nonlinear Optical Physics, October 1993.
  2. S. T. Wu, “Design of a liquid-crystal-based electro-optic filter,” Appl. Opt. 28, 48–52 (1989). [CrossRef] [PubMed]
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  10. See, e.g., L. Levi, Applied Optics (Wiley, New York, 1980), Vol. 2, Chap. 11.
  11. I. C. Khoo, S. T. Wu, Optics and Nonlinear Optics of Liquid Crystals (World Scientific, Singapore, 1993), Chap. 2. [CrossRef]

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