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Electrically Reconfigurable Liquid Crystalline Mirrors.

Kyung Min Lee1,2, Vincent P Tondiglia1,2, Timothy J White1

  • 1Air Force Research Laboratory, Materials & Manufacturing Directorate, Wright-Patterson Air Force Base, Dayton, Ohio 45433-7750, United States.

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Summary
This summary is machine-generated.

We demonstrate electrically reconfigurable cholesteric liquid crystals (LCs) for tunable light control. This advancement enables precise control over selective reflection for optical applications.

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Polymer Science

Background:

  • Reconfigurable optical materials are essential for advanced light control in applications like smart eyewear and architectural windows.
  • Cholesteric liquid crystals (LCs) offer tunable optical properties but often require complex control mechanisms.
  • Developing materials with electrically tunable selective reflection is a key challenge in photonics.

Purpose of the Study:

  • To report on the electrical reconfiguration of selective reflection in cholesteric liquid crystals (LCs).
  • To demonstrate a method for tuning the pitch and thus the reflection wavelength of LC-based optical elements.
  • To enable dynamic control over optical properties, including turning reflection on/off and broadening the reflection band.

Main Methods:

  • Preparation of a structurally chiral polymer stabilizing network to enforce anchoring of a low-molar-mass liquid crystalline media.
  • Utilizing liquid crystalline media with positive dielectric anisotropy for electrical field response.
  • Applying DC fields to directly regulate the pitch of reflective optical elements.
  • Employing AC fields to reorient LC molecules into a homeotropic (optically clear) state.

Main Results:

  • Achieved electrical tuning of reflection wavelength (red or blue shift) and broadening by regulating the pitch with a DC field.
  • Demonstrated the ability to switch selective reflection on and off using AC fields to induce homeotropic orientation.
  • Showcased dynamic control over the optical properties of cholesteric LCs, moving and widening reflection bands.
  • Characterized the electro-optic behavior of the developed reconfigurable optical materials.

Conclusions:

  • The developed structurally chiral polymer network enables electrical reconfiguration of cholesteric LC selective reflection.
  • These materials offer dynamic control over optical properties, including wavelength tuning and switching.
  • The findings represent a significant advancement towards practical applications of reconfigurable optical materials in optics and photonics.