Holographic Interferometry of 2D Imaging of Refraction Index and Surface Deformations were recorded in in real time video: (1) monitoring of local refraction index perturbation at accuracy of 10(-4) in transmission mode during heat and photochemical reactions with human hemoglobin using methylene blue, protoporphyrin IX and rhodamine as the photosensitizers and (2) monitoring in reflectance mode of human tooth local mechanical pressure at accuracy of 10(-7) m.

On the base of a new polyurethane with azobenzene dopants, recording media for polarization holography have been created, and their information properties have been studied when recording holograms of a plane wavefront. It has been found that the recording and relaxation times of holograms are short, and it is defined by the processes of trans-cis-isomerization of azobenzene groups without formation of the surface relief in the polymer film. The obtained results are of practical interest in the choice of photosensitive materials for holographic recording media for dynamic holography.

We report the preliminary results obtained for polymers incorporating the azobenzene side-group as an optically active molecule. The reversible change of the thin film absorption is observed when illuminating it with monochromatic linearly polarized light under the applied external DC field. The magnotude of a change depends on the angle between the light polarization and the DC electric field direction.

Photoconductive and photovoltaic properties of film composites based on poly-[Formula: see text]-epoxypropylcarbazole doped with a derivative of nickel dithiolene are investigated. These composites possess a hole-type photoconductivity. The internal photoeffect is attributed to the photogeneration of charge carriers from the metal complex and the hole transport through the donor fragments of the polymer matrix.

Two new symmetric azomethine dyes capable of photoinduced isomerization were synthesized by condensing symmetric bis-aldehyde (obtained by the reaction of epichlorohydrin with 4-oxybenzaldehyde) with 4-nitroaniline and 4-chloroaniline, respectively. The yield of the target products decreases with the transition from nitro-substituted azomethine to chlorine-substituted. This is due to the greater basicity of the starting amines with nitro-substitution when increasing the acceptor force of the substituent complicates the course of the reaction. Azomethines are characterized by absorption with a maximum at 400–410 nm, which makes them sensitive to radiation with a blue component of the spectrum. The photoelectric properties of azomethines upon irradiation were investigated by the method of measuring the surface potential with the help of a Kelvin dynamic probe. The maximum value of the electric potential of the photosensitive films free surface during irradiation with white LED at I = 60 W/m2 is about 270 mV in the case of azomethine with a nitro group in the 4,4' position and about 125 mV in the case of azomethine with chlorine as a substituent. That is, the magnitude of the electric potential of the free surface decreases approximately twice during the transition from nitro substituent to chlorine. This may be explained by the fact that the photoinduced changes in azomethine with a higher acceptor substituent flow more quickly and with greater efficiency. But at the same time, the reverse changes when turning off the light are just as fast. For chlorine substituted azomethine samples, the reverse process proceeds rather slowly, which may indicate greater stability over time of the photochemically modified form in case of chlorine substitution compared to the nitro-substituted analogue. Thus, the synthesized azomethines can be used in the development of new photovoltaic media and recording media for optical information recording.

Heat and photochemical reactions with human hemoglobin and photosensitizer were monitored by holography interference method in gelatin phantom. The method has successfully facilitated monitoring the reactions as a high-resolution refraction index mapping in real time video regime. Methylene Blue was exploited as a photosensitizer.

Polymers containing azobenzene dyes or azobenzene lateral groups are of special interest for their application as optically active media, particularly, as polarization sensitive media for such applications: optical data storage, surface nanostructuration, photoswitching, alignment of liquid crystals, active optical elements etc. An intensive research was carried out previous years on synthesizis and investigation of the second order nonlinear optical response of azobenzene/polymer systems. The desirable properties of these materials are attributed to the highly efficient photoinduced trans-cis and vice versa isomerization of azobenzene moieties. This transformation is connected with the volume change of molecules, followed by an increase of their rotational mobility. The trans-cis izomerization process is exploited also in all optical poling of polymers and plays an important role in optical depoling. Generally these phenomena are induced by light with frequencies corresponding to one-photon absorption. They are possible also by multiphoton absorptions. In this paper we report the synthesis of side chain methacrylic polymers functionalized with azobenzene chromophores. A reversible change of thin film absorption is observed when illuminating it with monochromatic, linearly polarized light under the applied external DC field. The amount of change depends on the angle between the light polarization and the DC electric field direction.

We propose new structures of polymeric composites with changeable optical characteristics (transmission and/or reflection of polarized light) under the influence of magnetic and/or electric fields. The new monomers 4-methacroyloxy-(4′-carboxy-3′-hydroxy)-azobenzene, 4-methacroyloxy-(4′-carboxy-3′-hydroxy)-2-nitroazobenzene,and 4-methacroyloxy-(4′-carboxy-3′-hydroxy)-2-diethylamino-azobenzene, their complexes with Co, and polymers based on their base are synthesized. The influence of the electric field on the absorption spectra of films of the new metal-containing azopolymers is investigated. The effect of an electric field on the transmission of a linearly polarized light through the films is revealed. This effect is determined by the re-orientation of the dipole moments of azobenzene groups which is induced by a polarized light under the action of an electric field. The increase of the dipole moments of azobenzene groups due to the introduction of donor and acceptor substituents reduces the influence of Co ions on the electrooptical properties of polymeric films.

ABSTRACT The peculiarities of charge flow mechanism in polymer films on the PEPC base with organic dyes of various ionic ability were investigated. The electroconductivity was established to depend on dye nature, their ionic ability and content in polymer media. The approximation of the current-voltage characteristics as exponential function was presented and the activation mechanism of charge flow in investigated structures was established. The activation energy of various system was estimated end established to depend on the dye concentration in PEPC. The self-organization as penta- and hexagons and aggregation in investigated structures obtained.

Thr features of photoconductivity of the films of poly-N-epoxypropylcarbazole doped with cationic. squarylium and merocyanine dyes are investigated. Under temperature growth starting from room the photoconductivity of the films with cationic anti squarylium dyes increases more strongly as compared to the similar films with merocyanine. It was explained by a destruction of structural traps close to electrically charged fragments of dyes. In contrast to the films of the first two types, the photoconductivity of the films with merocyanine dye depends sublinearly on incident light intensity due to an effective bimolecular charges recombination.