Photoinduced dichroism and optical anisotropy in a liquid-crystalline azobenzene side chain polymer caused by anisotropic angular distribution of trans and cis isomers

Blinov, Lev M.; Kozlovsky, Mikhail V.; Ozaki, Masanori; Skarp, Kent; Yoshino, K.

doi:https://doi.org/10.1063/1.368565

Photoinduced dichroism and optical anisotropy in a liquid-crystalline azobenzene side chain polymer caused by anisotropic angular distribution of trans and cis isomers

Blinov, Lev M.; Kozlovsky, Mikhail V.; Ozaki, Masanori et al.

Journal of Applied Physics, 1998, 84(7), 3860-3866

Number of Access:266（2025-09-02 10:24 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/75854

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Title	Photoinduced dichroism and optical anisotropy in a liquid-crystalline azobenzene side chain polymer caused by anisotropic angular distribution of trans and cis isomers
Creator	CreatorName Blinov, Lev M.
	CreatorName Kozlovsky, Mikhail V.
	NRID 1000050204186 1000050204186 ORCID 0000-0002-9556-4225 0000-0002-9556-4225 researchmap permalink read0014092 read0014092 Scopus Author ID 55490143900 55490143900 CreatorName Ozaki, Masanori
	CreatorName Skarp, Kent
	NRID 1000070029205 1000070029205 CreatorName Yoshino, K.
Description	This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Lev M. Blinov, Mikhail V. Kozlovsky, Masanori Ozaki, Kent Skarp, andKatsumi Yoshino, Journal of Applied Physics 84, 3860 (1998) and may be found at https://doi.org/10.1063/1.368565.
Abstract	Photochromism has been studied for two comb-like liquid-crystalline copolymers (I) and (II) containing azobenzene chromophores in their side chains. In a smectic glass phase of both copolymers, upon short-time irradiation by UV light, long-living cis isomers are observed. Both copolymers manifest the photoinduced anisotropy, the physical mechanisms of which seem to be quite different. In spin-coated films of polymer (II), the origin of the anisotropy is a strong stable dichroism, which is due to an enrichment and depletion of the chosen angular direction, correspondingly, with trans and cis isomers of the azobenzene chromophores. Polymer (I) manifests no dichroism at all, and its induced optical anisotropy may be accounted for by a rather slow chromophore reorientation. In copolymer (II) a considerable reorientation of the mesogenic groups also occurs as a secondary phenomenon at the stage of the cis isomer formation only. This observation shed more light on the general process of the light-induced molecular reorientation in polymers, liquid crystals, and Langmuir–Blodgett films, which is of great importance for holographic information recording.
Publisher	American Institute of Physics
Source Title	Journal of Applied Physics
Volume (Issue)	84(7)
Page	3860-3866
Date of Issued	1998-10-01
Language	English
Handle URL	https://hdl.handle.net/11094/75854
PISSN	00218979
eISSN	10897550
NCID	AA00693547
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1063/1.368565
Access Rights	open access
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Journal of Applied Physics. 1998, 84(7), p. 3860-3866
DC.title	Photoinduced dichroism and optical anisotropy in a liquid-crystalline azobenzene side chain polymer caused by anisotropic angular distribution of trans and cis isomers
DC.creator	Blinov, Lev M.
	Kozlovsky, Mikhail V.
	Ozaki, Masanori
	Skarp, Kent
	Yoshino, K.
DC.publisher	American Institute of Physics
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	1998-10-01
DC.identifier	https://doi.org/10.1063/1.368565
DC.description	This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Lev M. Blinov, Mikhail V. Kozlovsky, Masanori Ozaki, Kent Skarp, andKatsumi Yoshino, Journal of Applied Physics 84, 3860 (1998) and may be found at https://doi.org/10.1063/1.368565.
DCTERMS.abstract	Photochromism has been studied for two comb-like liquid-crystalline copolymers (I) and (II) containing azobenzene chromophores in their side chains. In a smectic glass phase of both copolymers, upon short-time irradiation by UV light, long-living cis isomers are observed. Both copolymers manifest the photoinduced anisotropy, the physical mechanisms of which seem to be quite different. In spin-coated films of polymer (II), the origin of the anisotropy is a strong stable dichroism, which is due to an enrichment and depletion of the chosen angular direction, correspondingly, with trans and cis isomers of the azobenzene chromophores. Polymer (I) manifests no dichroism at all, and its induced optical anisotropy may be accounted for by a rather slow chromophore reorientation. In copolymer (II) a considerable reorientation of the mesogenic groups also occurs as a secondary phenomenon at the stage of the cis isomer formation only. This observation shed more light on the general process of the light-induced molecular reorientation in polymers, liquid crystals, and Langmuir–Blodgett films, which is of great importance for holographic information recording.
DC.format	75854
citation_title	Photoinduced dichroism and optical anisotropy in a liquid-crystalline azobenzene side chain polymer caused by anisotropic angular distribution of trans and cis isomers
citation_author	Blinov, Lev M.
	Kozlovsky, Mikhail V.
	Ozaki, Masanori
	Skarp, Kent
	Yoshino, K.
citation_publisher	American Institute of Physics
citation_language	English
citation_date	1998-10-01
citation_journal_title	Journal of Applied Physics
citation_volume	84
citation_issue	7
citation_firstpage	3860
citation_lastpage	3866
citation_doi	https://doi.org/10.1063/1.368565
citation_public_url	https://hdl.handle.net/11094/75854

Photoinduced dichroism and optical anisotropy in a liquid-crystalline azobenzene side chain polymer caused by anisotropic angular distribution of trans and cis isomers

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