Azo polymers for reversible optical storage III Effect of film thickness on net phase retardation and writing speed

Rochon, P.; Bissonnette, D.; Natansohn, Almeria; Xie, Shuang

doi:10.1364/ao.32.007277

Cited by 65 publications

(51 citation statements)

References 6 publications

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“…We have also reported in Table 2B the relaxation parameters of the ν s (NO 2 ) vibration for different compositions of p(DR1A-co-MMA) copolymers. Since the dynamical parameters are very sensitive to the film thickness, only samples with a similar optical density can be compared; 50 consequently, lower concentrations of the azo species require thicker films. To minimize this effect, the parameters reported for each composition are the average of those calculated from at least five samples of similar thicknesses and the optical density of the ν s (NO 2 ) band ranged from 0.12 to 0.16.…”

Section: Methodsmentioning

confidence: 99%

Photoinduced Orientation of Azobenzene Chromophores in Amorphous Polymers As Studied by Real-Time Visible and FTIR Spectroscopies

et al. 1998

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ABSTRACT:In situ dynamical study of the photoinduced orientation of the DR1 azobenzene derivative in a doped PMMA matrix and in p(DR1A-co-MMA) copolymers was carried out using real-time visible and infrared spectroscopies. The different mechanisms occurring during the photoisomerization cycles were highlighted by following the time dependence of the normalized average absorbance (T 0), the normalized linear dichroism (T2) and the order parameter (P2) during the orientation (laser on) and the relaxation (laser off) periods. The thermal cis-trans back-relaxation and the angular redistribution were followed separately from the T0 and T2 relaxation curves, respectively. The orientation and relaxation curves were fitted by the Kohlrausch-Williams-Watts (KWW) function in order to compare the rate constant and the distribution width for various samples. On one hand, the chromophore-matrix interactions were investigated in doped systems by changing the tacticity of the PMMA matrix. On the other hand, the chromophore-chromophore interactions in functionalized polymers were studied by changing the concentration of azobenzene units in copolymer systems.

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Section: Methodsmentioning

confidence: 99%

Photoinduced Orientation of Azobenzene Chromophores in Amorphous Polymers As Studied by Real-Time Visible and FTIR Spectroscopies

et al. 1998

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“…Polymer P3 is amorphous, but nevertheless demonstrates a higher value of dichrosim in comparison with other azobenzene-containing amorphous polymers studied before (D % 0.1 À 0.2). [31][32][33] The possible explanation for such a difference may be the following. P3 consists of a long rigid mesogenic core that may play a crucial role in higher values of dichroism and their stability.…”

Section: Photo-orientation Phenomena In Spin-coated Polymer Filmsmentioning

confidence: 99%

Effect of Molecular Structure and Thermal Treatment on Photo‐optical Properties of Photochromic Azobenzene‐containing Polymer Films

Bobrovsky

Shibaev

Bubnov

et al. 2010

Macro Chemistry & Physics

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Three novel photochromic azobenzene‐containing comb‐shaped polyacrylates are synthesized and their phase behavior and photo‐optical properties are studied. The influence of the side photochromic group structure, thermal treatment, and light irradiation on aggregation of azobenzene chromophores in thin spin‐coated films of the polymers is investigated in detail. Special attention is paid to studying the photo‐orientation processes in polymers films induced by polarized blue light (473 nm). The relationship between the photochromic group architecture, phase behavior, thermal treatment of films, and kinetics of chromophore photo‐orientation is established and discussed. It is found that the position of the NN bond in chromophores plays an important role in the kinetics of the process, but does not affect the maximum value of dichroism. magnified image

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“…Its kinetics depends on whether the azobenzenes are chemically bonded onto the polymer backbones [6]. Photo-orientation depends on several factors, such as the free volume for the chromophores and the spacer between the azo groups, the main chain structure of the polymer [7][8][9][10], the light intensity, and the film thickness [11,12].…”

Section: Introductionmentioning

confidence: 99%

Molecular-level interactions of an azopolymer and poly(dodecylmethacrylate) in mixed Langmuir and Langmuir–Blodgett films for optical storage

Ceridório¹,

Balogh²,

Caseli

et al. 2010

Journal of Colloid and Interface Science

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a b s t r a c tThe applicability of azopolymers in optical storage can be extended through the use of nanostructured films produced with the Langmuir-Blodgett (LB) technique, but the film properties need to be optimized since these polymers generally do not form stable Langmuir films to be transferred onto solid substrates. Here, photoinduced birefringence was investigated for mixed Langmuir-Blodgett films from the homo-0 -nitroazobenzene (HPDR1-MA) and poly(dodecylmethacrylate) (HPDod-MA). The interactions between these polymers were studied in Langmuir and LB films. Surface pressure-area isotherms pointed to molecular-level interactions for proportions of 51 mf%, 41 mf% and 31 mf% of HPDR1-MA. Phase segregation was not apparent in the BAM images, in which the morphology of the blend film was clearly different from that of the Langmuir films of neat homopolymers. Through PM-IRRAS, we noted that the interaction between the azopolymer and HPDod-MA affected the orientation of carbonyl groups. Strong interactions for the mixture with 41 mf% of poly(dodecylmethacrylate) led to stable Langmuir films that were transferred onto solid supports as LB films. The photoinduced birefringence of 101-layer mixed LB films show features that make these films useful for optical storage, with the advantage of short writing times in comparison to other azopolymer films.

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Azo polymers for reversible optical storage III Effect of film thickness on net phase retardation and writing speed

Cited by 65 publications

References 6 publications

Photoinduced Orientation of Azobenzene Chromophores in Amorphous Polymers As Studied by Real-Time Visible and FTIR Spectroscopies

Photoinduced Orientation of Azobenzene Chromophores in Amorphous Polymers As Studied by Real-Time Visible and FTIR Spectroscopies

Effect of Molecular Structure and Thermal Treatment on Photo‐optical Properties of Photochromic Azobenzene‐containing Polymer Films

Molecular-level interactions of an azopolymer and poly(dodecylmethacrylate) in mixed Langmuir and Langmuir–Blodgett films for optical storage

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