Share Email Print
cover

Proceedings Paper

Optical control of the pitch in cholesteric liquid crystals
Author(s): Koichiro Shirota; Kaori Tachibana; Ichirou Yamaguchi
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper 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.

Paper Details

Date Published: 7 May 1999
PDF: 4 pages
Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); doi: 10.1117/12.347840
Show Author Affiliations
Koichiro Shirota, RIKEN--The Institute of Physical and Chemical Research (Japan)
Kaori Tachibana, Gakushuin Univ. (Japan)
Ichirou Yamaguchi, RIKEN--The Institute of Physical and Chemical Research (Japan)


Published in SPIE Proceedings Vol. 3740:
Optical Engineering for Sensing and Nanotechnology (ICOSN '99)
Ichirou Yamaguchi, Editor(s)

© SPIE. Terms of Use
Back to Top