Efficient holographic recording in novel azo-containing polymer (original) (raw)
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The Journal of Physical Chemistry B, 2010
Polarization grating recording in an amorphous and nonchiral azo copolymer has been investigated. The reported study shows that the amorphous polymeric film undergoes a light-guided inhomogeneous supramolecular modification as a consequence of the illumination with proper polarized light patterns, acquiring new functionalities. Both linear and circular, spatially modulated, photoinduced birefringences occur, attaining their peak values in the linearly and circularly polarized regions of the light pattern, respectively. The photoinduced anisotropic structures strongly affect the polarization state of the light propagating through them, and the characterization of their optical diffraction enables measurement of the amplitude of the linear and circular birefringences. The recorded gratings show long-time stability and full reconfigurability functional to the multiple holographic recording.
Azo-polymers for holographic recording: photo-assisted holography and surface relief gratings
2019
Azobenzene-containing polymers have attracted much attention as photo-responsive materials owing to potential applications in optical data storage and holographic recording. In holography, azobenzene compounds doped in a polymer matrix (guest- host polymer film) or chemically attached to the polymer (co-polymer) are among the most widely used materials. Azo-polymers exhibit differing behaviors when exposed to a pattern resulting from the interference of two coherent beams. In the guest-host system, the recorded grating corresponds to a contrast of refractive index between the dark and bright areas of the film, and in the co-polymer, interference patterns lead to surface height modulation; i.e. surface relief gratings (SRGs). The latter is due to photo-induced mass movement of the polymer from bright to the dark area of the interference pattern in the direction of the intensity gradient, and the photoisomerization force is at the origin of the formation of the gratings. In this paper...
Holographic grating recording in azobenzene functionalized polymers
Central European Journal of Chemistry, 2006
A group of 22 polymers have been synthesized to test their suitability for recording holographic gratings. Polyamides, polyimides, polyesters and their combinations were functionalized with pendant azobenzene groups containing single or double N=N. The polymers were studied using a standard degenerate two-wave mixing technique, which enables measurement of light-induced periodic modification of polymer refractive index and absorption coefficient by analysis of the diffracted light. Two qualitatively different configurations of the holographic polarization recording were used, s − s and s − p. The relationship between structural properties of polymer matrix and azobenzene groups and the holographic grating recording kinetics and light diffraction efficiency was investigated.
The Journal of Chemical Physics, 2005
Pulsed light-induced recording in azobenzene polymers has recently been studied due to its potential use in optical storage applications. In this paper we study the photoinduced birefringence ͑⌬n͒ and holographic grating recording in an azobenzene side chain liquid-crystalline polymethacrylate irradiating with a single 4 ns light pulse at 532 nm. For some irradiation conditions, ⌬n grows in less than 50 ns reaching an essentially stable value of about 10 −2 . Holographic gratings have been registered using intensity and polarization patterns. Fast response and stability, similar to those of ⌬n, was observed in the holographic recording process. Both light-induced anisotropy and relief contributions have been found in the case of gratings recorded using intensity patterns, relief being the dominant contribution at high recording energies. Polarization gratings have been recorded using two orthogonally circularly polarized beams. The resultant gratings showed stable efficiencies up to 0.8% ͑measured at 633 nm in 1-m-thick films͒ and no measurable relief was observed.
Photoreversible holographic recording in azo-dye-containing polymer films
2003
The peculiarities of optical recording in the films of azo dye containing amorphous and liquid-crystalline polymers have been studied experimentally and theoretically. A simplified theoretical model of light induced processes in the azocontaining media has been elaborated. The model considers interaction of linearly-polarized light with a thin polymer layer. We derived analytical expressions for the light-induced refractive index and the absorption coefficient. Theoretical results are in good agreement with the experimental data. We have investigated features of holographic recording in amorphous and liquid-crystalline polymer samples. Recording of multiple holograms in polymer films with different structure was also demonstrated.
Photoassisted Holography in Azo Dye Doped Polymer Films
The Journal of Physical Chemistry B, 2016
Holographic storage is one of the most important applications in the field of optics, especially for recording and retrieving data, and information storage by interference patterns in photosensitive materials are no exception in this regard. In this work, we give evidence that holograms recorded by interference of two coherent laser beams in azo dye doped polymer films can be controlled by a third incoherent assisting laser beam. We show that light diffraction can be increased or decreased by an assisting beam depending on the respective orientation of the polarizations of the recording and the assisting beams. We also found that photomanipulation of polarization holograms, prepared by polarization modulation, does not depend on the polarization of the assisting beam, whereas, photomanipulation of holograms prepared by intensity modulation strongly depends on the polarization of the assisting beam. Photoselection is shown to play a major role in the photoassisted diffraction process.
Optical Materials, 2017
Recently, a birefringence enhancement effect was observed in azopolymers doped with various nanoparticles. The paper presents comparison between the parameters of polarization holographic gratings recorded in a pure azopolymer PAZO (Poly[1-[4-(3-carboxy-4-hydroxyphenylazo) benzenesulfonamido]-1,2-ethanediyl, sodium salt]) and in a hybrid PAZO-based organic/inorganic material with incorporated ZnO nanoparticles of size less than 50 nm. Laser emitting at 491 nm is used for the holographic recording. Along with the anisotropic grating in the volume of the media, surface relief is also formed. Gratings with different spatial frequencies are obtained by varying the recording angle. The time dependence of the diffraction efficiency is probed at 635 nm and the height of the relief gratings is determined by AFM. Our results indicate that both the diffraction efficiency and the height of the surface relief for the hybrid samples are enhanced with respect to the pure azopolymer films.
Carbazole-Based Azopolymers as Media for Polarization Holographic Recording
2020
In this paper we report on direct holographic recording of surface relief gratings in carbazolebased azopolymers. Azo dye Disperse Orange 3 was chemically bonded to oligomer poly-N-(epoxypropyl carbazole) making surface deformation efficient in the presence of optical field gradient. Optimal concentration of azo dye and the film thickness were determined. Evolution of the transmittance spectrum upon irradiation with 473 nm laser light clearly demonstrated the photo-induced isomerization of azopolymer sample. Holographic recording at different polarization configurations showed that the P:P polarization of recording beams provides the maximum of diffraction efficiency about 33%. Investigation of the obtained gratings revealed that this value of diffraction efficiency is caused by surface relief modulation (up to 440 nm) during holographic recording. The good coincidence of experimental and theoretical values of diffraction efficiency in dependence on surface profile depth may be the ...
Photoreversible holographic recording in azo-dye-containing polymer films
Optical Information, Data Processing and Storage, and Laser Communication Technologies, 2003
The peculiarities of optical recording in the films of azo dye containing amorphous and liquid-crystalline polymers have been studied experimentally and theoretically. A simplified theoretical model of light induced processes in the azocontaining media has been elaborated. The model considers interaction of linearly-polarized light with a thin polymer layer. We derived analytical expressions for the light-induced refractive index and the absorption coefficient. Theoretical results are in good agreement with the experimental data. We have investigated features of holographic recording in amorphous and liquid-crystalline polymer samples. Recording ofmultiple holograms in polymer films with different structure was also demonstrated.
Recording Polarization Holograms in Polymer Films with Azo Dyes and Azo Polymers
Optics and Spectroscopy, 2019
Based on polymers with the addition of azo dyes as chromophores and azopolymers with the same covalently linked chromophores, recording media for polarization holography are created and their properties are studied when recording holograms of a plane wave front with parallel and perpendicular polarization of recording rays. It is found that the diffraction efficiency and the storage time of holograms are much longer in recording media with films of azo polymers in comparison with polymeric solid solutions of azo dyes. In the latter case, the energy of light is spent only for the trans-cis isomerization of azo dye molecules during exposure of holograms and the polymer chains do not undergo deformation with the formation of a surface relief in the polymer film. Therefore, it is preferable to use recording media based on solid solutions of azo dyes in dynamic polarization holography.