Unusual electro-optic Kerr response in a self-stabilized amorphous blue phase with nanoscale smectic clusters
Unusual electro-optic Kerr response in a self-stabilized amorphous blue phase with nanoscale smectic clusters
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具有纳米级近晶簇的自稳定非晶蓝相中不寻常的电光克尔响应
DOI：
10.1002/cphc.201501206
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发表时间：
2016
期刊：
影响因子：
2.9
通讯作者：
F. Araoka
中科院分区：
文献类型：
--
作者：
K. V. Le;M. Hafuri;H. Ocak;B. Bilgin-Eran;C. Tschierske;T. Sasaki;F. Araoka
我们研究了“雾”无定形蓝相（BPIII）以及各向同性相中的电光响应。据我们所知，由于BPIII的热范围非常有限，尚未进行此类研究。在这项研究中，我们使用了具有自稳定BPIII的单组分手性弯芯液晶，该液晶在宽温度范围内稳定。结果表明，在各向同性阶段，响应时间大约为数百微秒，在BPIII中增加到1-2 ms（atTI-BP-T <1），然后在BPIII中进一步冷却时急剧增加到几十毫秒。 这种不寻常的行为被解释的基础上的高旋转粘度和/或纳米级近晶（Sm）集群的存在。同时还测量了克尔常数，发现其值为2500 pm V−2，这是迄今为止报道的弯曲芯BP系统中最大的，与聚合物稳定的BP相当。
We investigated the electro‐optic response in the “foggy” amorphous blue phase (BPIII) as well as in the isotropic phase. To the best of our knowledge, such a study has not yet been performed due to the very limited thermal range of BPIII. In this study, we used a single‐component chiral bent‐core liquid crystal with a self‐stabilized BPIII, which is stable over a wide temperature range. The results show that the response time is on the order of hundreds of microseconds in the isotropic phase and increases to 1–2 ms in the BPIII (atTI−BP–T<1), then drastically increases up to a few tens of milliseconds upon further cooling in BPIII. Such an unusual behavior was explained on the basis of the high rotational viscosity and/or the existence of nanoscale smectic (Sm) clusters. The Kerr constant was also measured and found to be ∼500 pm V−2, which is the largest among bent‐core BP systems reported so far and comparable with that of polymer‐stabilized BPs.