Organic nanoparticle (hyperbranched polymer)-dispersed photopolymers for volume holographic storage

Tomita, Yasuo; Furushima, Kouji; Ochi, Koichiro; Ishizu, Koji; Tanaka, Akihiro; Ozawa, Masaaki; Hidaka, M.; Chikama, Katsumi

doi:10.1063/1.2175485

Cited by 71 publications

(40 citation statements)

References 15 publications

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“…The potential of these materials for use in holographic applications has been demonstrated with great success [1][2][3]. Their wide application [3][4][5][6][7][8][9] has made the use of photopolymers as optical materials an interesting field of research.…”

Section: Introductionmentioning

confidence: 99%

Surface relief model for photopolymers without cover plating

et al. 2011

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Relief surface changes provide interesting possibilities for storing diffractive optical elements on photopolymers and are an important source of information to characterize and understand the material behaviour. In this paper we present a 3-dimensional model based on direct measurements of parameters to predict the relief structures generated on the material. This model is successfully applied to different photopolymers with different values of monomer diffusion. The importance of monomer diffusion in depth is also discussed.

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Section: Introductionmentioning

confidence: 99%

Surface relief model for photopolymers without cover plating

et al. 2011

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“…Photopolymer based recording materials have been widely studied for holographic applications [1][2][3][4]. Their good properties, such as high diffraction efficiencies, low noise, self-developing, easy preparation, high thickness, low cost, etc., make these holographic recording materials optimum candidates for many holographic devices such as holographic memories [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Real-time interferometric characterization of a polyvinyl alcohol based photopolymer at the zero spatial frequency limit

et al. 2007

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We characterize the optical modulation properties of a polyvinyl alcohol͞acrylamide (PVA͞AA) photopolymer at the lowest end of recorded spatial frequencies. To achieve this goal we have constructed a double beam interferometer in combination with the setup to expose the recording material. This is a novel approach since usually holographic recording materials are only characterized at high spatial frequencies. Some benefits are provided by the approach we propose: a direct calculation of the properties of the material is possible, and on the other hand additional information can be obtained since the results are not influenced by diffusion processes. Furthermore, this characterization is needed to optimize the PVA͞AA photopolymers for another range of applications, such as recording of diffractive optical elements, where very low spatial frequencies are recorded. Different PVA͞AA compositions and layer thicknesses have been analyzed. We have found that, depending on the layer characteristics, we can achieve high values of the phase-shift modulation depth and enhance the sensitivity of the material.

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“…Photopolymer properties, such as high diffraction efficiencies, low noise, self-developing, easy preparation, high thickness, low cost, etc., make these optical recording materials optimum media for many applications [1][2][3]. Photopolymer formulations contain a dye, a cosensitizer, one or two monomers and a binder.…”

Section: Introductionmentioning

confidence: 99%

In dark analysis of PVA/AA materials at very low spatial frequencies: phase modulation evolution and diffusion estimation

et al. 2009

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Molecular diffusion effects have been widely studied inside photopolymers for holographic applications. Recently some works have focused on low spatial frequencies to evaluate in real time the monomer diffusion effects. Assuming a Fermi-Dirac function-based profile, we have fitted the diffracted intensities, reflected and transmitted (up to the 8th order), to obtain the phase and surface profile of the recorded gratings. We have studied the influence of diffusion in polyvinyl-alcohol/acrylamide for the range of spatial frequencies between 2 lines/mm and 6 lines/mm. We have demonstrated the influence of the spatial frequency on the magnitude and sign of the material volume variations. We also studied in dark the evolution of the grating shape. We show that it is possible to achieve diffractive gratings with diffraction efficiency in the first order near 35% if the in dark evolution is taken into account. Furthermore we present a method to calculate the monomer diffusivity in photopolymers. The differential equation is deduced and solved, and experimental average value is obtained (D=1.1·10 −8 cm 2 s −1 ).

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Organic nanoparticle (hyperbranched polymer)-dispersed photopolymers for volume holographic storage

Cited by 71 publications

References 15 publications

Surface relief model for photopolymers without cover plating

Surface relief model for photopolymers without cover plating

Real-time interferometric characterization of a polyvinyl alcohol based photopolymer at the zero spatial frequency limit

In dark analysis of PVA/AA materials at very low spatial frequencies: phase modulation evolution and diffusion estimation

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