Backflow-mediated domain switching in nematic liquid crystals.

Area of Science:

• Physics
• Materials Science

Background:

• Nematic liquid crystals exhibit complex director reorientation dynamics under electric fields.
• The Freedericksz transition describes the threshold electric field for reorientation.
• Understanding dynamic effects like kickback is crucial for liquid crystal device applications.

Purpose of the Study:

• To investigate the nematic liquid crystal kickback effect upon primary electric field removal.
• To study the amplification of this effect by a secondary electric field.
• To explore the formation of domains with reversed director orientation.

Main Methods:

• Computational fluid dynamics (CFD) simulations were employed.
• The study considered the dynamics in three dimensions.
• The research simulated complex scenarios with multiple irregular Freedericksz domains.

Main Results:

• The kickback effect and subsequent domain formation were observed.
• Domain formation was shown to be a robust phenomenon.
• The process was validated in realistic, complex 3D experimental conditions.

Conclusions:

• Domain switching by kickback amplification is a viable phenomenon.
• This effect can be utilized to self-insert shell-like inhomogeneities.
• It offers a novel method to create controlled structures in uniform director fields.