New Principle of Optical Data Recording Based on Reversible Transition “Selective Reflection—Absorbance” in Photochromic Cholesteric Copolymers
作者:
Alexey Bobrovsky,
Natalia Boiko,
Kjeld Shaumburg,
Valery Shibaev,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 2000)
卷期:
Volume 352,
issue 1
页码: 429-437
ISSN:1058-725X
年代: 2000
DOI:10.1080/10587250008023201
出版商: Taylor & Francis Group
关键词: cholesteric copolymers;photochromic spiropyran-containing groups;optical photorecording
数据来源: Taylor
摘要:
A new principle of information storage based on a realization of the reversible transition <<selective reflection-absorbance>> in photochromic liquid crystalline (LC) copolymers was suggested. For this purpose a new family of triple copolymers were synthesized by copolymerization of acrylic monomers, containing nematogenic (phenylbenzoate), chiral (cholesterol), and photochromic (spiropyran) fragments. Phase behaviour and optical properties of copolymers were studied. Isomerization of spiropyran groups and formation of merocyanine form under UV-irradiation (337 nm) of the polymer films was observed. It should be noted that the maximum of the absorbance of polymer films coincides with maximum of selective light reflection. As a result the disappearance of the selective light reflection in the irradiated regions of the films occurs. Scheme of the optical data recording and reading of information recorded on planarly oriented films of such copolymers was proposed.
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