Electrically Switchable and Permanently Stable Light Scattering Modes by Dynamic Fingerprint Chiral Textures

Area of Science:

• Materials Science
• Optoelectronics
• Physics

Background:

• Liquid crystals (LCs) are widely used in display technologies.
• Developing stable and efficient light modulators remains an active research area.
• Chiral textures in LCs offer unique optical properties.

Purpose of the Study:

• To develop electrically switchable and permanently stable scattering mode light modulators.
• To investigate dynamic fingerprint chiral textures (DFCT) for light modulation.
• To explore the use of azobenzene-doped nematic LCs for advanced optical devices.

Main Methods:

• Doping negative dielectric nematic liquid crystals with two azobenzene materials.
• Utilizing dynamic fingerprint chiral textures (DFCT) with inhomogeneously helical axes.
• Applying electric fields with varying frequencies to switch between transparent and scattering states.

Main Results:

• Achieved electrically switchable and permanently stable scattering mode light modulators.
• Demonstrated switching between transparent (large DFCT domains) and scattering (small DFCT domains) states.
• Observed that switching voltage amplitude decreases with increasing electric field frequency.

Conclusions:

• The developed DFCT-based light modulators exhibit low operating voltage and permanently stable transmission.
• These devices offer a wide viewing angle, high contrast, and polarization-independent operation.
• The study highlights the advantages of the light scattering mode of DFCT for practical applications.