Photochromic command surface induced switching of liquid crystal optical waveguide structures
作者:
Harald Knobloch,
Horst Orendi,
Michael Bu¨chel,
Takahiro Seki,
Shinzaburo Ito,
Wolfgang Knoll,
期刊:
Journal of Applied Physics
(AIP Available online 1995)
卷期:
Volume 77,
issue 2
页码: 481-487
ISSN:0021-8979
年代: 1995
DOI:10.1063/1.359028
出版商: AIP
数据来源: AIP
摘要:
We report on optical waveguide structures containing a thin liquid crystal (LC) film held between two photochromic command surfaces. The command surfaces consist of three monomolecular layers of a polymer with azobenzene side chains deposited according to the Langmuir–Blodgett–Kuhn technique. When exposed to light of appropriate wavelength, the command surfaces undergo atrans↔cisphotoisomerization process that induces a reversible change in the liquid crystalline orientation. Such an orientation change of the LC alters the optical properties of the optical waveguide. We present experiments on the dynamics of the LC orientation process. The transition is shown to be continuous, with the degree of orientation dependent on the ratio of thecis‐transchromophore concentration ratio in the command surface. ©1995 American Institute of Physics.
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