The switching properties of chiral nematic liquid crystals using electrically commanded surfaces

The switching properties of chiral nematic liquid crystals using electrically commanded surfaces
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使用电控表面的手性向列液晶的开关特性

DOI:
10.1039/b810691f
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发表时间:
2009
期刊:
影响因子:
3.4
通讯作者:
Choi S
Choi S
中科院分区:
化学2区
文献类型:
--
作者:
Choi S

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在本文中,我们详细描述了使用电活性铁电液晶(FLC)产生表面介导开关的手性向列液晶(N * LC)的电光子带隙(PBG)调谐特性。 PBG 的调谐是由于 N*LC 分子在 FLC/N*LC 界面处的面内旋转被动引起的螺旋收缩的结果。我们提供了有关样品制备的详细信息,并讨论了当开关表面的数量从仅一个表面增加到顶部和底部表面时如何改变调谐范围。发现这种效应是完全可逆的,并且在调整过程中结构的质量没有明显的变化。然而,据观察,一旦施加或去除电场,达到平衡所需的时间比限制在传统聚酰亚胺摩擦基板之间的 FLC 的响应时间长得多。这是由于 N*LC 的弹性恢复力和粘度造成的。然而,这种调节带隙的方法在需要可调谐带通滤波器和/或可调谐激光器的生物医学和传感应用中具有潜在用途。
In this paper, we describe in detail the electrical photonic band gap (PBG) tuning properties of a chiral nematic liquid crystal (N*LCs) using electrically active ferroelectric liquid crystals (FLCs) to generate surface mediated switching. The tuning of the PBG occurs as a result of a contraction of the helix which is induced passively by the in-plane rotations of the N*LC molecules at the FLC/N*LC interface. We provide detail on the preparation of the samples and discuss how the tuning range is altered when the number of switching surfaces increases from just one surface to both top and bottom surfaces. The effect is found to be completely reversible and there is no apparent change in the quality of the structure during tuning. It is observed, however, that the time required to reach equilibrium once an electric field is applied or removed is much longer than the response time of the FLC confined between conventional polyimide rubbed substrates. This is due to the elastic restoring force and viscosity of the N*LC. Nevertheless, this approach to tuning the band gap is of potential use in biomedicine and sensing applications whereby a tunable band-pass filter and/or tunable lasers are required.
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