An Investigation of the Photoinduced Changes of Absorption of High-Performance Photoaddressable Polymers

Srikhirin, Toemsak; Cimrová, Věra; Schiewe, Beate; Tzolov, Marian; Hagen, Rainer; Kostromine, S.; Bieringer, Thomas; Neher, Dieter

doi:10.1002/1439-7641(20020415)3:4<335::aid-cphc335>3.0.co;2-o

Cited by 7 publications

(3 citation statements)

References 18 publications

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“…The investigation of such polymers as thick films (>1 µm) has already been performed earlier 3 . When the almost isotropic films were irradiated an almost oblate order was found in accordance with other investigations 2,4 . A strong dependence of the behaviour after annealing on the polymer structure and on the interfacial conditions was found in this earlier investigation.…”

Section: Introductionsupporting

confidence: 91%

Three-dimensional anisotropies induced by light in thin polymer films

Jung¹,

Stumpe

2003

SPIE Proceedings

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The three-dimensional structure of thin anisotropic polymer films is of great importance for many applications, such as display technology and optical data storage. We developed different methods for the accurate determination of the inplane and the out-of-plane anisotropy of thin polymer films. The anisotropic properties are generated or modified by irradiation with polarized light at room temperature and subsequent thermal development of the liquid crystalline polymers. For the characterisation of thin films different ellipsometric methods and absorbance measurements were developed and for thick films the prism coupling method was used. The three-dimensional structure of the films and the resulting optical properties are strongly dependent on thickness and preparation of the films. The photoinduced order is generated by the photoorientation of azobenzene containing side chain polymers. This order is changed by annealing of the films in the liquid crystalline phase of the polymers. For thinner spin coated films the order after annealing is almost a prolate in-plane order. This should be caused by the initial in-plane order induced by the spin coating process. In the case of thicker films the order after annealing is homeotropic due to the interfacial order. Under certain conditions even an oblate order was found after annealing.

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Section: Introductionsupporting

confidence: 91%

Three-dimensional anisotropies induced by light in thin polymer films

Jung¹,

Stumpe

2003

SPIE Proceedings

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“…Recently, an application of the azo containing polymers for rewritable holographic data storage has attracted great attention because the optical data are reversibly recordable on a thin film of the material [10][11][12][13][14][15]. When a linearly polarized excitation beam is irradiated to a thin film of azo containing polymer, the azo chromophores reorient perpendicular to the direction of incident beam polarization via photoisomerization process.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and optical properties of Azo-methacrylic copolymers with rigid tolane moiety

Kim¹,

Fukuda²

2007

Reactive and Functional Polymers

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“…8,9) Photoaddressable polymers have been extensively investigated for reversible optical storage. 10,11) From a practical viewpoint, large birefringence (Án) materials play an important role in efficient optical media such as digital holographic memory applications. One of the most important key factors for photoinduced Án is the molecular cooperative motion of its neighboring side groups.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Dipole Moment of Chromophores and Photoinduced Birefringence

Kim

Fukuda

2006

jjap

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In this paper, we describe the result of studies on photoinduced birefringence (Δn) properties of amorphous azobenzene copolymer consisting of nonpolar long π-conjugated chromophore and polar chromophores. In particular, we studied the relationship between the dipole moment balance of chromophores and the Δn properties that can be used for holographic data storage. The polymer films were obtained by spin coating (d=0.8 µm) and were irradiated with a linear polarized Ar+ ion laser beam (λ=488 nm, irradiance = 1 W/cm2). Then the Δn was probed simultaneously with a He–Ne (λ=633 nm) laser using a polarimeter and calibrated in relation to film thickness. From the result, the observed Δn value decreased as the difference in the dipole moment between the two chromophores increased. As far as the investigation in this experiment are concerned, the largest photoinduced birefringence value, 0.244, was achieved with the poly{4-[2-(methacryloyloxy)ethyloxy]-2-methyl-4-(phenylazo)azobenzene-co-4-[2-(methacryloyloxy)ethyloxy]-4'-cyanoazobenzene}. This might be explained from the viewpoint of the dipole matching that will contribute molecular cooperative motion between two azo chromophores in the copolymer.

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An Investigation of the Photoinduced Changes of Absorption of High-Performance Photoaddressable Polymers

Cited by 7 publications

References 18 publications

Three-dimensional anisotropies induced by light in thin polymer films

Three-dimensional anisotropies induced by light in thin polymer films

Synthesis and optical properties of Azo-methacrylic copolymers with rigid tolane moiety

Relationship between Dipole Moment of Chromophores and Photoinduced Birefringence

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