强极性添加剂对介电负向列相各向同性相和向列相纳秒电光效应的增强
Enhanced nanosecond electro-optic effect in isotropic and nematic phases of dielectrically negative nematics doped by strongly polar additive
摘要：
电场可以诱导或改变液晶（LC）的各向同性相和双折射相中的光学双折射。在各向同性相位中，电场引起双折射，其中光轴沿着场。这种现象被称为克尔效应。克尔效应的模拟是通过纳秒级的序参量电修正（NEMOP）来改变现有的双折射，而不需要光轴的重新对准。这两种效应在实际应用中的效用受到由场引起的相对弱的双折射的挑战。我们通过向介晶材料中加入具有大横向偶极矩的非介晶添加剂2，3-二氰基-4-戊氧基苯基4 '-戊氧基苯甲酸酯（DPP）来解决这个问题，以增强它们的负介电各向异性。DPP掺杂大大增加了NEMOP和克尔效应中的场致双折射，高达0.02。掺杂也会减慢开关过程，但如果需要，这种影响可以通过提高工作温度来补偿。通过非介晶掺杂剂的场致双折射的增强为纳秒电光效应的实际应用铺平了道路。
英文摘要：
An electric field can induce or modify optical birefringence in both the isotropic and nematic phases of liquid crystals (LCs). In the isotropic phase, the electric field induces birefringence with an optical axis along the field. The phenomenon is known as the Kerr effect. In the nematic, the analog of the Kerr effect is the change of existing birefringence through nanosecond electric modification of order parameters (NEMOP) that does not require realignment of the optic axis. The utility of both effects for practical applications is challenged by a relatively weak birefringence induced by the field. We address the issue by adding a non-mesogenic additive 2, 3-dicyano-4-pentyloxyphenyl 4'-pentyloxybenzoate (DPP) with a large transverse dipole moment to mesogenic materials in order to enhance their negative dielectric anisotropy. The DPP doping substantially increases the field-induced birefringence in both NEMOP and Kerr effects, up to 0.02. The doping also slows down the switching processes, but this effect can be compensated by rising working temperatures, if necessary. The enhancement of field induced birefringence by the non-mesogenic dopant paves the way for practical applications of nanosecond electro-optic effects.
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