Variable optical attenuator based on polymer stabilized twisted nematic liquid crystal

Yan Qing Lu*, Fang Du, Yi-Hsin Lin, Shin Tson Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)1221-1227
Number of pages7
JournalOptics Express
Volume12
Issue number7
DOIs
StatePublished - 1 Jan 2004

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