Abstract
Liquid crystals act on the amplitude and the phase of a wave front under applied electric fields. Ordinary LCs are known as field induced birefringence, thus both phase and amplitude modulation strongly depend on the voltage controllable molecular tilt. In this work we present electrooptical properties of novel liquid crystal (LC) mixture with frequency tunable capabilities from 100Hz to 10 KHz at constant applied voltage. The frequency tunability of presented mixtures shown here came from composition of three different families of rodlike liquid crystals. Dielectric measurements are reported for the compounds constituting frequency-controlled birefringence liquid crystal. Characterization protocols allowing the optimum classification of different components of this mixture, paying attention to all relevant parameters such as anisotropic polarizability, dielectric anisotropy, and dipole moment are presented.
Highlights
Spatial light modulators (SLMs) based on liquid crystals (LCs) require very specific combinations of physical properties of liquid crystal mixtures to operate efficiently, requiring different combinations of components
The longitudinal electric dipole moment of the component (I) is about 12,4 debye due to a triple −CN bond; the permanent dipole moment forms an angle with the molecular axis equal to 18.21◦. This group of compounds is characterized by dielectric anisotropy ∆ε in the range from 60 to 80, which can be realized by the use of polar chemical groups, making this component a highly polar nematics liquid crystal
In the context of the dielectric properties of the three components forming the multifrequency driven LCs mixture, their dielectric properties are of interest from a number of aspects
Summary
Spatial light modulators (SLMs) based on liquid crystals (LCs) require very specific combinations of physical properties of liquid crystal mixtures to operate efficiently, requiring different combinations of components. At much higher frequency of the applied electric field, the molecular dipoles do not rotate fast enough to contribute to the dielectric response, the phase shift between the electric field E and electric polarization occurs This delay yields to the dielectric relaxation of the LC molecules, causing the dielectric dispersion and losses [4]. The possibility of designing mixtures with very low relaxation frequencies is useful for a dual frequency addressing displays [10] Such mixture is usually formed by a combination of many components such as molecules having large transverse dipole moment with ∆ε < 0 and molecules with a large longitudinal dipole moment with ∆ε > 0 [11]. The mesomorphic properties of the three components of the mixture under study and electro-optical features in new formulated mixture are reported
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