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Proceedings Article

Optical control of the pitch in cholesteric liquid crystals

[+] Author Affiliations
Koichiro Shirota, Ichirou Yamaguchi

RIKEN--The Institute of Physical and Chemical Research (Japan)

Kaori Tachibana

Gakushuin Univ. (Japan)

Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), 372 (May 7, 1999); doi:10.1117/12.347840
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From Conference Volume 3740

  • Optical Engineering for Sensing and Nanotechnology (ICOSN '99)
  • Ichirou Yamaguchi
  • Yokohama, Japan | June 16, 1999

abstract

It has been shown that optical control of a spiral pitch in cholesteric liquid crystals (CLCs) by laser light irradiation is possible. Because of the spiral periodic structure, the CLCs shows unique optical characteristics with various polarization dependence. Then, the CLCs have a potential for application to polarization selective device whose properties can be changed by light irradiation. The CLC used was a mixture of cholesteryl chloride and cholesteryl pelagonate, and a mixing ratio selected for the wavelength of a probe laser was CC:CP equals 33.6:66.4. To control the pitch, CLCs was doped with azobenzene at a concentration of 5 mol%. Optical isomerization of the dye molecules induced a change of the pitch, and hence the selective reflection band is shifted. Irradiation by a He-Cd and an Ar+ laser shifted the selective reflection band of sample to shorter and longer wavelength, respectively. Hereby the spiral pitch in CLC was reversibly changed by 10 nm.

© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Koichiro Shirota ; Kaori Tachibana and Ichirou Yamaguchi
"Optical control of the pitch in cholesteric liquid crystals", Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), 372 (May 7, 1999); doi:10.1117/12.347840; http://dx.doi.org/10.1117/12.347840


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