Forming a latent associative image in photothermoplastic media in comparison with an image in a photorefractive crystal

Давиденко, Н. А.; Derzhipol'skii, A. G.; Melenevskii, D. A.; Gnatovskii, A. V.; Ищенко, А. А.; Mysyk, D. D.; Mysyk, Roman

doi:10.1364/jot.72.000754

Cited by 4 publications

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“…The band of optimal spatial frequencies (∆ϖ) was found from the halfwidth of the transfer characteristic [6]. The values of ∆ϖ = 200-1500 mm -1 and the optimal spatial frequency ϖ opt = 350-1000 mm -1 found this way did not differ when the oligomer composite was changed, and are close to the analogous values for recording media based on PEPC [7]. So all the studied recording media allow us to obtain holographic images of objects of satisfactory quality (Fig.…”

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Holographic recording media based on oligomers and co-oligomers with organic dye additives

et al. 2007

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We have created holographic recording media based on films of carbazolyl-, fluorenyl-, naphthyl-, and anthracenyl-containing oligomers and co-oligomers in which an intraionic organic dye is used as the sensitizer. We have established that the photoconductivity of the films and the photosensitivity of the recording media are higher in the case of co-oligomers with different donor moieties. We conclude that in the films of co-oligomers with different donor moieties in the "end" groups of the polymer chain, there is reduced probability of formation of excimers, which are centers for capturing photogenerated charge carriers, and therefore the photoconductivity of the film increases.Introduction. The photothermoplastic (PTP) method for recording optical information is used for archiving information, preserving valuable documents, and artistic holography, and also is very suitable for holographic interferometry and nondestructive testing due to the high resolution and fast dry development of holograms without changing the position of the recording medium [1,2]. The recording medium is made in the form of a thin oligomeric film deposited on an electrically conducting undercoat. Generally such films are an oligomer-based composite (oligomer composite in the following) with hole type conductivity and containing organic sensitizer additives [3]. The sensitizers provide absorption of light and photogeneration of charge carriers at the emission wavelength of the laser used, and sometimes also electron transport [2]. Organic dyes are also used as sensitizers [4]. In this work, we have carried out a comparative study of the photoconductivity of oligomer composite films based on carbazolyl-, fluorenyl-, naphthyl-, and anthracenyl-containing oligomers and co-oligomers, in which an intraionic organic dye is used as light absorption centers and centers for photogeneration of charge carriers; we have also investigated the basic informationrelated characteristics of holographic recording media based on these oligomer composites for the photothermoplastic method of recording holograms.The Experiment. We studied films of the oligomers PEPC, OGF, OAGE and the co-oligomers coo-FGE-AGE, coo-AGE-β-NGE with the bipolar squarylium dye SQ:

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Holographic recording media based on oligomers and co-oligomers with organic dye additives

et al. 2007

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“…Original article submitted November 7, 2008. Samples for the studies were prepared as structures with a free surface: (glass substrate)-(PVE + PD film), (glass substrate)-(electrically conductive SnO 2 : In 2 O 3 layer)-(PVE + PD film), and as sandwich structures: (glass substrate)-(electrically conductive SnO 2 : In 2 O 3 layer)-(PVE + PD film)-Ag. The PD concentration was 1 wt.%, which usually ensures efficient photogeneration and transport of charge carriers [1, [5][6][7], and in this case no substantial aggregation of the dyes occurs. The procedure for measuring the optical density (D) and fluorescence intensity (I L ) spectra is described in [2,3].…”

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Effect of a d.c. electric field on the fluorescence spectra of cationic polymethine dyes in a polymer film

et al. 2008

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We have observed that in an external d.c. electric field, in the differential fluorescence spectra of both symmetric and asymmetric polymethine dyes in a polymer film, the intensity of the emission in the long-wavelength region of the band increases while the intensity in the short-wavelength region decreases. In symmetric polymethines, these effects are opposite to those in the differential absorption spectra, while in asymmetric polymethines they are symbatic. The spectral effects were interpreted by a change in the probability of the vibronic transitions due to redistribution of electron density in the chromophore, in the ground state and the excited state of the dye, in an external electric field.Key words: polymethine dyes, electronic structure, absorption and fluorescence spectra, external electric field.Polymethine dyes (PDs) have recently been used as working media in unconventional fields for them, such as information technology, photovoltaics, and electroluminescence [1]. These media are used in an external electric field of strength 10 8 V/m, which is comparable with the intraatomic fields in conjugated organic molecules. The targeted search for dyes for such media is why there is a need to establish the characteristics of the effect of a external d.c. electric field on their spectral luminescence properties as a function of the dye structure. In [2, 3], such characteristics were obtained for the absorption spectra. In this paper, we have made the first attempt to study the effect of an external electric field on the fluorescence spectra of cationic polymethine dyes.As the dyes, we used the cationic symmetric PDs I-III and the asymmetric PD IV [4]. The latter is a hybrid of the corresponding symmetric PD I and II. We used polyvinylethylal (PVE) as the polymer matrix. This polymer is characterized by good film-forming and optical properties. It has high ionization potential and low electron affinity energy, and consequently it does not have either electronic or hole intrinsic conductivity.

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Anomalous Change of Refractive Index for Au Sols Under Laser Illumination

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et al. 2019

Springer Proceedings in Physics

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Forming a latent associative image in photothermoplastic media in comparison with an image in a photorefractive crystal

Cited by 4 publications

References 0 publications

Holographic recording media based on oligomers and co-oligomers with organic dye additives

Holographic recording media based on oligomers and co-oligomers with organic dye additives

Effect of a d.c. electric field on the fluorescence spectra of cationic polymethine dyes in a polymer film

Anomalous Change of Refractive Index for Au Sols Under Laser Illumination

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