Photo-switchable chiral liquid crystal with optical tristability enabled by a photoresponsive azo-chiral dopant

Yu Cheng Hsiao, Kuan Chung Huang, Wei Lee

Research output: Contribution to journalArticle

12 Citations (Scopus)


A light-driven tristable chiral-tilted homeotropic nematic (TCHN) cell is demonstrated. The liquid-crystal cell is photo-switchable among the three stable states: the tilted-homeotropic, fingerprint, and the tilted-twist states. The inclusion of a photosensitive chiral bis(azobenzene) compound into a typical nematic liquid crystal makes the resulting material possible to switch from one to another stable state directly and reversibly owing to the photoinduced trans-cis isomerization of the azo-chiral dopant and, hence, the configurational change of the liquid crystal via the guest-host effect. By further introducing dichroic dyes into the TCHN system, we devised a polarizer-free display and light modulators. The novel TCHN composite material opens up new possible applications in light-driven optical elements and devices.

Original languageEnglish
Pages (from-to)2687-2693
Number of pages7
JournalOptics Express
Issue number3
Publication statusPublished - Feb 6 2017
Externally publishedYes


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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