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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 12, Iss. 7 — Apr. 5, 2004
  • pp: 1221–1227

Variable optical attenuator based on polymer stabilized twisted nematic liquid crystal

Yan-qing Lu, Fang Du, Yi-Hsin Lin, and Shin-Tson Wu  »View Author Affiliations

Optics Express, Vol. 12, Issue 7, pp. 1221-1227 (2004)

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A variable optical attenuator (VOA) based on polymer stabilized twisted nematic (PSTN) liquid crystal (LC) is demonstrated. Comparing with the normal twisted nematic LC-based VOA, PSTN exhibits a much faster response time. Moreover, the polymer networks effectively eliminate the backflow effect which exists in the normal TNLC cell. The attenuation mechanism of the PSTN LC was studied. Both polarization rotation and light scattering effects are found to contribute to the optical attenuation. The ratio between these two mechanisms can be adjusted by changing the polymer concentration and polymer network domain size.

© 2004 Optical Society of America

OCIS Codes
(160.5470) Materials : Polymers
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Research Papers

Original Manuscript: January 30, 2004
Revised Manuscript: March 17, 2004
Published: April 5, 2004

Yan-qing Lu, Fang Du, Yi-Hsin Lin, and Shin-Tson Wu, "Variable optical attenuator based on polymer stabilized twisted nematic liquid crystal," Opt. Express 12, 1221-1227 (2004)

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