Synthesis and ferroelectric properties of some chiral dopants with a terphenyl central core

Phase modulation and ellipticity of the light transmitted through a smectic C* layer with short helix pitch

“…The dopant belongs to derivatives of p-terphenyl-dicarboxylic acid, which even though non-mesogenic, can increase the temperature range of the Cphase of the mixtures formed with the achiral smectic C matrix [3][4][5]. We synthesised a new dopant of this series, possessing the highest helical twisting power: the helix pitch in smectic C* mixtures is very short, i.e.…”

The quadratic electro-optical effect in ferroelectric liquid crystal helical nanostructures: role of the driving voltage shape

“…Ellipticity e vs. E in a 44-µm-thick DHF cell subjected to a STAIR voltage as compared with a Step one, where E is the intensity field at peak(-). Notice that the ellipticity oscillation density as for 16-30 µm cell is smaller in the case of STAIR: in the linearity range 0-2.5 V µm −1 , there are 10 Step maxima and only 7 STAIR ones. Maxima corresponds to e < 1 (and not to e = 1) and some minima to e > 0 (and not to e = 0), due to alignment distortion close to surface and to measurement uncertainty.…”

“…Lebedev Physical Institute of Russian Academy of Sciences as a mixture formed with the achiral smectic C matrix [9][10][11][12] and a nonmesogenic dopant belonging to derivatives of Step. The driving voltage curves reported represent the amplifier input (amplifier gain = 20), and the signal of the light transmittance I measured by a photodiode is given as a voltage in 10 mV unit, being in the picture scale multiplied by 100 times.…”