Polymer-Stabilized Micropixelated Liquid Crystals with Tunable Optical Properties Fabricated by Double Templating

Area of Science:

• Soft matter physics
• Materials science
• Nanotechnology

Background:

• Stimuli-responsive soft materials and topological defects in liquid crystals (LCs) are crucial for self-assembly and electro-optical applications.
• Existing methods for large-area periodic defect patterning are limited, hindering high-throughput fabrication.

Purpose of the Study:

• To develop an effective, low-cost, bottom-up method for fabricating large-area periodic patterns of topological defects in nematic liquid crystals (NLCs).
• To stabilize these NLC patterns using photopolymerization for reproducible self-organization and explore their applications.

Main Methods:

• Fabrication of a micropixelated NLC structure with a square array of topological defects stabilized by photopolymerization.
• Formation of a polymer network on a self-organized NLC template to imprint nonpolymerizable NLC molecules.
• Utilizing photocuring of local regions to create designable templates for defect self-organization.
• Employing a highly diluted polymer network (≈0.1 wt% monomer) for instant on-off switching.

Main Results:

• Successful stabilization of a large-area square array of topological defects in NLCs via photopolymerization.
• Imprinting of nonpolymerizable NLC molecules that retain their stimuli-responsive properties.
• Demonstration of instant on-off switching of NLC patterns using a highly diluted polymer network.
• Evidence of unique applications for anisotropic polymer networks incorporating self-organized NLC patterns.

Conclusions:

• The photopolymerization method provides a scalable and cost-effective approach for fabricating periodic topological defect patterns in NLCs.
• The resulting anisotropic polymer networks exhibit stimuli-responsive behavior and enable novel applications.
• This work advances the fabrication techniques for soft matter self-organization and electro-optical devices.