Normally transparent smart window based on electrically induced instability in dielectrically negative cholesteric liquid crystal

Chun Wei Chen, Alyssa N. Brigeman, Tsung Jui Ho, Iam-choon Khoo

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We demonstrate a normally transparent smart window based on a cholesteric liquid crystal with negative dielectric anisotropy. The window is electrically switchable between clear and diffuse states. The clear state exhibits a well-aligned planar cholesteric texture and is stable in the absence of an electric field, while the diffuse state is switched on when applying a field higher than the undulation instability threshold. The degree of translucency can be controlled by varying the field strength. When the applied field is removed, the smart window relaxes back to the clear state spontaneously. It is also found that a much faster diffuse-clear process can be stimulated by reducing the field below the instability threshold. The smart window presents itself a promising projector screen for augmented reality applications as it features single stable state, sub-second switching speed, and polymerizationfree fabrication.

Original languageEnglish (US)
Pages (from-to)691-697
Number of pages7
JournalOptical Materials Express
Volume8
Issue number3
DOIs
StatePublished - Jan 1 2018

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Cholesteric liquid crystals
Augmented reality
Anisotropy
Textures
Electric fields
Fabrication

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials

Cite this

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abstract = "We demonstrate a normally transparent smart window based on a cholesteric liquid crystal with negative dielectric anisotropy. The window is electrically switchable between clear and diffuse states. The clear state exhibits a well-aligned planar cholesteric texture and is stable in the absence of an electric field, while the diffuse state is switched on when applying a field higher than the undulation instability threshold. The degree of translucency can be controlled by varying the field strength. When the applied field is removed, the smart window relaxes back to the clear state spontaneously. It is also found that a much faster diffuse-clear process can be stimulated by reducing the field below the instability threshold. The smart window presents itself a promising projector screen for augmented reality applications as it features single stable state, sub-second switching speed, and polymerizationfree fabrication.",
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Normally transparent smart window based on electrically induced instability in dielectrically negative cholesteric liquid crystal. / Chen, Chun Wei; Brigeman, Alyssa N.; Ho, Tsung Jui; Khoo, Iam-choon.

In: Optical Materials Express, Vol. 8, No. 3, 01.01.2018, p. 691-697.

Research output: Contribution to journalArticle

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