4.6 Article

Electro-optic response of polymer-stabilized blue phase liquid crystals

Journal

APPLIED PHYSICS LETTERS
Volume 105, Issue 1, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.4890031

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Funding

  1. Industrial Technology Research Institute (ITRI, Taiwan)

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The dynamic response of a polymer-stabilized blue phase liquid crystal (BPLC) is comprised of two distinct processes: Kerr effect-induced local reorientation and electrostriction-induced lattice distortion. A double exponential rise/decay model is proposed to analyze the underlying physical mechanisms. If the electric field is below a critical field (E-c), Kerr effect dominates and the response time is fast. However, when E>E-c electrostriction effect manifests, leading to an increased response time and a noticeable hysteresis. A higher polymer concentration helps suppress electrostriction, but the tradeoff is increased operation voltage. These results provide useful guidelines for future BPLC material and device optimizations. (C) 2014 AIP Publishing LLC.

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