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Rewritable optical memory in liquid crystals containing photo-epimerizing Cr(III) complexes.

Hisako Sato1, Fumi Sato, Akihiko Yamagishi

  • 1Department of Chemistry, Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan. sato.hisako.my@ehime-u.ac.jp

Chemical Communications (Cambridge, England)
|April 18, 2013
PubMed
Summary

Researchers developed a novel optical memory device using a photosensitive metal complex, [Cr((-)-tfac)3]. This chiral nematic liquid crystal memory is written via photo-epimerization and read using circular dichroism, demonstrating rewritability.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Photochemistry

Background:

  • Chiral nematic liquid crystals exhibit unique optical properties.
  • Photosensitive metal complexes offer potential for optical data storage.
  • Developing rewritable optical memory is a key technological goal.

Purpose of the Study:

  • To introduce a concept for optical memory utilizing a photosensitive metal complex.
  • To investigate the use of [Cr((-)-tfac)3] as a dopant for inducing chiral nematic phases.
  • To explore the writing, reading, and rewriting mechanisms of this optical memory system.

Main Methods:

  • Synthesizing and doping liquid crystals with the photosensitive metal complex, [Cr((-)-tfac)3].
  • Inducing chiral nematic phases using the dopant.

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  • Writing memory states via photo-epimerization of the metal complex.
  • Reading memory states by analyzing circular dichroism spectra.
  • Testing rewritability through thermal cycling between liquid crystalline and isotropic phases.

    • Main Results:

    • Successful induction of chiral nematic phases by doping with [Cr((-)-tfac)3].
    • Demonstration of memory writing through photo-epimerization.
    • Read-out of stored information via circular dichroism spectroscopy.
    • Evidence of rewritability by cycling through phase transitions.

    Conclusions:

    • The photosensitive metal complex [Cr((-)-tfac)3] is a viable dopant for creating chiral nematic liquid crystal-based optical memory.
    • Photo-epimerization provides a mechanism for writing data.
    • Circular dichroism is an effective method for reading the stored optical memory.
    • The system exhibits potential for rewritable optical data storage applications.