Deformed-helix ferroelectric liquid crystals (DHFLCs) with sub-wavelength helix pitch usually demonstrate sub-millisecond electro-optical response time, but they cannot provide pure phase modulation. However, here, it is shown experimentally that the planar aligned 50 μm thick layer of ferroelectric liquid crystal (FLC) mixture can be used as an electro-optical medium for the phase spatial light modulators (SLMs) if the mixture exhibits smectic C* phase (SmC*) with the helix pitch around 100 nm or less and operates in DHFLCs electro-optical mode. The electrically controlled spiral phase plate (SPP) was constructed on the base of non-chiral biphenylpyrimidines as liquid crystal smectic C matrix and trifluoromethylalkyl diester of p-terphenyldicarboxylic acid as a non-mesogenic chiral dopant. This SPP is able to form and reconfigure the vortex light fields at the frequency up to 3 kHz that was not yet achieved using known liquid crystal spatial light modulators.

具有亚波长螺旋螺距的变形螺旋铁电液晶（DHFLC）通常显示亚毫秒级的电光响应时间，但它们不能提供纯相位调制。但是，这里通过实验表明，如果混合物显示出近晶C *相，则平面排列的50μm厚的铁电液晶（FLC）混合物层可用作相空间光调制器（SLM）的电光介质（SmC *）的螺距约为100 nm或更小，并且以DHFLCs电光模式工作。以非手性联苯嘧啶为液晶近晶C基体和p的三氟甲基烷基二酯为基础，构建了电控螺旋相板（SPP）。-三苯基二羧酸作为非介晶手性掺杂剂。该SPP能够以高达3 kHz的频率形成和重新配置涡旋光场，而使用已知的液晶空间光调制器尚无法实现。