Influence of rubbing-alignment on microwave modulation induced by liquid crystal

Autor: Wenjiang Ye, Hongyu Xing, Xuan Zhou, Yubao Sun, Zhidong Zhang
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: AIP Advances, Vol 5, Iss 6, Pp 067145-067145-8 (2015)
Druh dokumentu: article
ISSN: 2158-3226
DOI: 10.1063/1.4922960
Popis: The microwave modulation induced by liquid crystal is decided by the liquid crystal director distribution under an external applied voltage. The rubbing-alignment of substrate has an effect on the liquid crystal director, which must result in the change of microwave phase-shift. To illustrate the influence of rubbing-alignment on the microwave phase-shift, the microwave modulation property of twisted nematic liquid crystal is researched adopting the elastic theory of liquid crystal and the finite-difference iterative method. The variations of microwave phase-shift per unit-length for different pre-tilt and pre-twist angles of liquid crystal on the substrate surface and anchoring energy strengths with the applied voltage are numerically simulated. The result indicates that with the increase of pre-tilt angle and with the decrease of anchoring energy strength the weak anchoring twisted cell with pre-twisted angle 90° relative to the strong anchoring non-twisted cell can increase the microwave phase-shift per unit-length. As a result, for achieving the maximum microwave modulation, the weak anchoring twisted cell with pre-tilt angle 5° and anchoring energy strength 1×10−5J/m2 should be selected, which provides a reliably theoretical foundation for the design of liquid crystal microwave modulator.
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