Pozhidaev E P, Minchenko M V, Kuznetsov A V, Tkachenko T P, Barbashov V A
Opt Lett. 2022 Apr 1;47(7):1598-1601. doi: 10.1364/OL.450919.
A chiral smectic liquid crystal in which a ferrielectric phase with a helix pitch p less than 125 nm exists over a temperature range of at least from -3°C to +36°C has been developed. Such a wide temperature range (including room temperatures) of the ferrielectric phase with a subwavelength helix pitch has been achieved for the first time, to the best of our knowledge, which creates opportunities for the practical use of ferrielectric liquid crystals. A quadratic electro-optical effect caused by deformations of the helix in an electric field is observed in the ferrielectric phase, and the Kerr coefficient, which reaches almost 200 nm/V, is significantly higher than the same coefficient for the blue phase and for the smectic C* phase, which means a higher sensitivity of the developed ferrielectric liquid crystal to the electric field. The electro-optical response time does not exceed 300 s at room temperatures for this ferrielectric liquid crystal.
已经开发出一种手性近晶型液晶，其中螺旋节距p小于125nm的铁电相在至少从-3°C至+36°C的温度范围内存在。据我们所知，首次实现了具有亚波长螺旋节距的铁电相在如此宽的温度范围（包括室温）内存在，这为铁电液晶的实际应用创造了机会。在铁电相中观察到由电场中螺旋变形引起的二次电光效应，其克尔系数几乎达到200nm/V，显著高于蓝相和近晶C*相的相同系数，这意味着所开发的铁电液晶对电场具有更高的灵敏度。对于这种铁电液晶，在室温下电光响应时间不超过300μs。
