Hologram recording and the electrooptic effect in azobenzene derivative polymers and azobenzene derivative-cobalt polycomplexes

We have recorded holograms in films of a 4-methacroyloxy-(4¢-carboxy-3¢-hydroxy)-2-chloroazobenzene polycomplex with cobalt, for parallel and orthogonal orientation of the light beam polarization. The increase in the diffraction efficiency of the holograms and the decrease in their relaxation time in the case of orthogonal polarization compared with the case of parallel polarization of the recording light beams are connected with features of the structural rearrangement of the polymer matrix. We hypothesize that the information-related characteristics of the recording medium created can be controlled by external electric or magnetic fields, due to the presence of magnetic metal ions in the composition of the medium.Films of polymer composites with monomers of azo dyes or containing azobenzene side groups chemically bonded to the polymer backbone have optically active properties [1-3], and they can be used to design electro-optical light modulators [4] and recording media for polarization holography [5][6][7]. It has been suggested that using such polycomplexes as recording media allows us to increase the recording density for optical data, due to the possibility of controlling the process of recording and reading the data using external electric or magnetic fields. However, to date the question of the possibility of recording polarization holograms in films of azobenzene polycomplexes with metals has not been sufficiently studied, and the mechanism for such recording has not been established. The aim of this work was to study the hologram recording and relaxation kinetics in films of an azobenzene complex with cobalt, and also to study the electrophysical, photophysical, and photodielectric properties of these films.We synthesized a 4-methacroyloxy-(4¢-carboxy-3¢-hydroxy)-2-chloroazobenzene polycomplex with cobalt (PA-Co). The synthesis was carried out in several steps: azo dye -monomer -monomer complex -polycomplex.4-Methacroyloxy-(4¢-carboxy-3¢-hydroxy)-2-chloroazobenzene was synthesized by cold diazotization of p-aminosalicylic acid by treatment with sodium nitrate in the presence of hydrochloric acid, followed by an azo coupling reaction with 2-chlorophenol in alkaline medium. The monomer was obtained by acylation of the azo component by methacrylic acid chloride in the presence of triethylamine as the hydrogen chloride acceptor in a tetrahydrofuran solution. The monomer obtained was purified by recrystallization from ethanol. 540040-5760/09/4501-0054

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“…The procedure for preparation of the recording medium is described in [8]. The thickness of the PA-Co films was 1.8-2.0 µm.…”

Section: -Hydroxymentioning

confidence: 99%

Recording medium based on a polymer azobenzene complex with cobalt for polarization holography

Давиденко

Павлов

et al. 2009

Theor Exp Chem

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“…But if immediately after exposure of the holo- Fig. 1 Hologram recording (1, 2) and relaxation (3)(4)(5)(6) kinetics in the case E 1 N E 2 (1, 3, 5) and E 1 M E 2 (2,4,6); curves 3, 4 were obtained using the reference beam after exposure and storage of the recording media in the dark; curves 5, 6 were obtained when reading with the reference beam immediately after exposure, exposure time 1.5⋅10 3 sec. gram, the polymer film is briefly heated above the glass transition temperature, then this may result in fixation and long-term preservation of the hologram recording [15].…”

Section: Introductionmentioning

confidence: 99%

“…Films of polymer composites with azo dye monomers or containing azobenzene side groups chemically bonded to the polymer backbone have optically active properties, which can be used to design electro-optical light modulators [1,2] and holographic recording media [3][4][5][6][7]. When these films are exposed to linearly polarized light, photoinduced optical anisotropy appears, which is caused by a change in the concentrations of trans and cis isomers of the azobenzene groups.…”

Section: Introductionmentioning

confidence: 99%

Films made of substituted azobenzene polycomplexes with cobalt for polarization holography

et al. 2007

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We have studied the possibility of recording holograms in films of the 4-methacroyloxy-(4′-carboxy-3′-hydroxy)-2-chloroazobenzene polycomplex with cobalt, with parallel and orthogonal orientation of the light beam polarization. We have shown that these films can be used as recording media for polarization holography. The characteristic features of relaxation of the diffraction efficiency of the holograms are connected with cistrans isomerization of the azobenzene groups and the characteristic features of structural rearrangement in the polymer matrix. We hypothesize that the information-related characteristics of the studied recording media can be controlled by external electric or magnetic fields, due to the presence of magnetic metal ions within the polymer film.

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“…Owing to the fact that the dipole moment of the optical transition of the dyes is oriented approximately along their long molecular axis, absorption of light by the molecules depends essentially on the angle between the axis of the molecule and the electric polarization vector of the light. Therefore polymer composites based on azo dyes can be used as optically active media for recording optical polarization holograms, obtaining liquid-crystal structures and materials for recording information [4][5][6][7][8][9][10][11][12][13]. The induced polarization can be changed by means of external thermal or mechanical treatment (on heating or exposure to light, in an external electric field).…”

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confidence: 99%

Electro-optical properties and photopolarization anisotropy of methacrylic azopolymer films

et al. 2009

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We have synthesized polymethacrylates with azobenzene side moieties and "spacers" of different lengths. We have studied the spectra and kinetics of the electro-optical effect appearing in films of such azopolymers after they are exposed to linearly polarized light. The nature of the electro-optical effect is explained by the appearance of photoinduced optical anisotropy in the films, due to a change in the ratio of the concentrations of trans and cis isomers of the azobenzene moieties. The characteristic time required for establishment and relaxation of photoinduced optical anisotropy correlates with the times required for a change in the dielectric characteristics of the studied films when exposed to linearly polarized light.

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Hologram recording and the electrooptic effect in azobenzene derivative polymers and azobenzene derivative-cobalt polycomplexes

Cited by 26 publications

References 14 publications

Recording medium based on a polymer azobenzene complex with cobalt for polarization holography

Recording medium based on a polymer azobenzene complex with cobalt for polarization holography

Films made of substituted azobenzene polycomplexes with cobalt for polarization holography

Electro-optical properties and photopolarization anisotropy of methacrylic azopolymer films

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