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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

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Giant Flexoelectro-optic Effect with Liquid Crystal Dimer CB7CB.

Andrii Varanytsia¹, Liang-Chy Chien¹

¹Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, Ohio 44242, USA.

Scientific Reports

|January 25, 2017

Summary

We report giant flexoelectric-optic effects in liquid crystal dimer CB7CB, achieving full light modulation with rapid switching times. This breakthrough enables advanced applications in fast electro-optic devices.

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Area of Science:

Materials Science
Condensed Matter Physics

Background:

Flexoelectricity in liquid crystals offers unique electro-optic responses.
Liquid crystal dimers are promising materials for advanced photonic applications.

Purpose of the Study:

To demonstrate and characterize the giant flexoelectric-optic behavior of the liquid crystal dimer CB7CB.
To explore the potential of CB7CB in fast-switching electro-optic devices.

Main Methods:

Experimental characterization of flexoelectric properties using polymer-stabilized uniform lying helix cholesteric liquid crystals.
Measurement of the in-plane rotation angle of the helical axis (HA).

Main Results:

A giant flexoelectric-optic effect was observed in CB7CB.
A 45° rotation of the helical axis was achieved at 4.5 V/μm, enabling full light intensity modulation.
Sub-millisecond electro-optic switching times were recorded.

Conclusions:

CB7CB exhibits significant flexoelectric-optic properties.
The material's performance is suitable for applications requiring fast electro-optic switching.
This research paves the way for novel flexoelectric-based photonic devices.