The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform

Vincent M Rotello - One of the best experts on this subject based on the ideXlab platform.

Graeme Cooke - One of the best experts on this subject based on the ideXlab platform.

Richard Kowarschik - One of the best experts on this subject based on the ideXlab platform.

  • New holographic polymeric composition based on plexiglass, polyvinyl butyral, and phenanthrenquinone
    Optics Communications, 2013
    Co-Authors: Vladislav Matusevich, Elena Egorova, Yuri Ivanovich Matusevich, Elen Tolstik, Richard Kowarschik, Leonid Krul
    Abstract:

    The newly developed Plexiglas films containing polyvinyl butyral resins and Phenanthrenequinone molecules as photosensitive dopant, which are proposed for the practical application as interlayer of laminated safety glass, are shown for the first time. The injection of the Phenanthrenequinone-poly(methyl methacrylate) into the polyvinyl butyral protective interlayer provides a homogenous distribution of the recording holographic medium in the layer and allows fixing the entire surface grating in the laminated glass. In addition, the original properties of polyvinyl butyral as a connecting material were preserved during manufacturing of the laminated glass. This allows a recording of holographic structures directly after baking of the laminated glass, thus reducing the destruction of the gratings due to the elevated temperatures. The diffractive structures in Phenanthrenequinone-poly(methyl methacrylate)- polyvinyl butyral polymeric layers with thicknesses of hundreds of microns are sealed between two panels of glass (so-called laminated glass) and are generated by illumination with an Argon-laser of 514 nm. Efficiently fixed and long-term stable holographic gratings recorded in the Phenanthrenequinone-poly(methyl methacrylate)-polyvinyl butyral layer enable to produce transparent laminated glass with inserted diffractive elements, which can be used e.g. for Head-up Displays in automobile windshields or as holographic light concentrators for solar cells. © 2013 Elsevier B.V.

  • numerical investigation of the 1 1 d self trapping of laser beams in polymeric films based on polymethylmethacrylate and Phenanthrenequinone
    Journal of The Optical Society of America B-optical Physics, 2009
    Co-Authors: O Kashin, Vladislav Matusevich, Elen Tolstik, Richard Kowarschik
    Abstract:

    An analytical description connected with a numerical calculation of the propagation of self-trapped laser beams in a polymethylmethacrylate matrix containing Phenanthrenequinone molecules is presented. A theoretical model for the spatial distribution of boundary optical waves is developed in dependence on characteristic beam parameters.

  • Head-Up-Displays based on polymethylmethacrylate with Phenanthrenequinone
    CLEO Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009
    Co-Authors: Elen Tolstik, Yuri Ivanovich Matusevich, Vladislav Matusevich, Richard Kowarschik, U. V. Mahilny, D N Marmysh, A. Winkler, Leonid Krul
    Abstract:

    The authors present the experimental realization of a Head-Up-Display (HUD) based on a photopolymer. The aim of our work is to develop a new HUD screen with a holographic grating in photopolymer based on Plexiglas (polymethylmethacrylate, PMMA) and photosensitive Phenanthrenequinone (PQ) molecules for vehicle windshields.

  • PMMA-PQ Photopolymers for Head-Up-Displays
    IEEE Photonics Technology Letters, 2009
    Co-Authors: Elen Tolstik, Yuri Ivanovich Matusevich, Vladislav Matusevich, Richard Kowarschik, D. N. Marmysh, A. Winkler, Uladzimir V. Mahilny, Leonid Krul
    Abstract:

    We present the experimental realization of a head-up-display based on a photopolymer. A phase volume reflection hologram is written in a photopolymer layer and is used as a screen for a signal beam. To write efficient holograms in the polymeric material we used ordinary and modified polymethylmethacrylate matrices containing Phenanthrenequinone (PQ). Increasing the PQ concentration gives us an opportunity to realize thinner layers (

  • non local response in glass like polymer storage materials based on poly methylmethacrylate with distributed Phenanthrenequinone
    Optics Express, 2008
    Co-Authors: Elen Tolstik, Yuri Ivanovich Matusevich, Vladislav Matusevich, Richard Kowarschik, O Kashin, A Matusevich, Leonid Krul
    Abstract:

    The development of volume phase gratings written by two-wave-mixing in glass-like polymer storage materials based on poly (methylmethacrylate) and its thermostable derivative (copolymer with acrylic acid) with distributed Phenanthrenequinone is investigated experimentally and theoretically. The maximal diffraction efficiency is considered in dependence on the grating period. The redistribution processes of the molecules are described with a one-dimensional diffusion model yielding the existence of a non-local response in the photopolymer layer, and the corresponding non-local response length of Phenanthrenequinone is found experimentally.

Bruce M. Greenberg - One of the best experts on this subject based on the ideXlab platform.

  • examination of the mechanism of Phenanthrenequinone toxicity to vibrio fischeri evidence for a reactive oxygen species mediated toxicity mechanism
    Environmental Toxicology and Chemistry, 2009
    Co-Authors: Wenxi Wang, Julie A Nykamp, Xiaodong Huang, Karen E Gerhardt, George D Dixon, Bruce M. Greenberg
    Abstract:

    Phenanthrenequinone (PHQ) is a photoproduct of phenanthrene, one of the most prevalent polycyclic aromatic hydrocarbons in the environment. Phenanthrenequinone is a compound of substantial interest, because its toxicity can be much greater than its parent chemical to aquatic organisms. The toxicity mechanisms of PHQ to the luminescent marine bacterium Vibrio fischeri were examined in the present study. Phenanthrenequinone can redox cycle in bacterial cells and transfer electrons to O2, enhancing the production of superoxide (O•−2), hydrogen peroxide (H2O2), and other reactive oxygen species (ROS). Exposure of cells to PHQ increased activity of superoxide dismutase (SOD), which detoxifies the ROS superoxide. Concentrations of PHQ that induced the production of H2O2 and other ROS, as well as the elevated levels of Fe-SOD, were correlated with its toxicity as measured by luminescence. Furthermore, toxicity of PHQ to V. fischeri was lowered under the anaerobic conditions, suggesting that the absence of oxygen, which would limit the production of ROS, alleviated toxicity of PHQ. Thus, a ROS-mediated toxicity mechanism of PHQ is highly implicated by in the present study.

  • Toxic photoproducts of phenanthrene in sunlight
    1995
    Co-Authors: B.l. Mcconkey, Yousef El-alawi, D. G. Dixon, C L Duxbury, Bruce M. Greenberg
    Abstract:

    Phenanthrene, one of the most prevalent PAHs, undergoes a significant increase in toxicity on exposure to sunlight. Over a period of several days exposure to light, the toxicity of an aqueous phenanthrene solution increased dramatically. This increase in toxicity is largely due to the primary photoproduct, 9,10-Phenanthrenequinone. This compound is more toxic than phenanthrene at equimolar concentrations, and is more water soluble than phenanthrene, increasing its bioavailability. Although many PAHs are potent photosensitizers, phenanthrene did not exhibit a significant increase in toxicity due to photosensitization. Photo-oxidation was the principal cause of photoinduced toxicity, with 9,10-Phenanthrenequinone being formed via an unstable intermediate. In addition, mixtures of phenanthrene and 9,10-Phenanthrenequinone exhibited potentially synergistic effects, as shown by joint toxicity testing using Photobacterium phosphoreum. Thus, mixtures of oxidized PAHs produced by photoaction in the environment create a significant risk to the biosphere.

  • Toxic photoproducts of phenanthrene and anthracene in sunlight
    1995
    Co-Authors: C L Duxbury, B.l. Mcconkey, Ali Mallakin, D. G. Dixon, Bruce M. Greenberg
    Abstract:

    Phenanthrene and anthracene, two of the most prevalent PAHs, undergo significant increases in toxicity on exposure to sunlight. Over a period of several days exposure to light, the toxicity of an aqueous solution of phenanthrene or anthracene increased dramatically. This increase in toxicity is largely due to the primary products formed by these two PAHs due to light exposure. These compounds are more toxic than the parent compounds at equimolar concentrations. Although anthracene is a potent photosensitizer, phenanthrene did not exhibit a significant increase in toxicity due to photosensitization. Photo-oxidation was the principal cause of photoinduced toxicity, with 9,10-Phenanthrenequinone being the primary product. This compound is more water soluble than phenanthrene increasing its bioavailability. In addition, mixtures of phenanthrene and 9,10-Phenanthrenequinone exhibited toxicity similar to the quinone added alone. This was shown by joint toxicity testing using Lemna gibba and Daphnia magna. These two organisms are currently being used in the lab to further test individual oxidized products of anthracene and phenanthrene that occur as a result of exposure to sunlight.

Demetri Psaltis - One of the best experts on this subject based on the ideXlab platform.

  • comparison of the recording dynamics of Phenanthrenequinone doped poly methyl methacrylate materials
    Optics Communications, 2001
    Co-Authors: Jose Mumbru, Iouri Solomatine, Demetri Psaltis, Wei Zheng Chen, Whatzong Whang
    Abstract:

    A comparative analysis of Phenanthrenequinone-doped poly(methyl methacrylate) materials fabricated at California Institute of Technology and National Chiao Tung University is performed in order to understand the differences exhibited in their recording and baking dynamics.

  • holographic data storage in Phenanthrenequinone doped pmma
    Optoelectronics '99 - Integrated Optoelectronic Devices, 1999
    Co-Authors: Gregory J Steckman, Iouri Solomatine, Gan Zhou, Demetri Psaltis
    Abstract:

    Phenanthrenequinone (PQ)-doped poly(methyl methacrylate) (PMMA) is a photopolymer holographic recording material that can be made in large thicknesses and does not exhibit any shrinkage. Holograms are made permanent by a post-recording diffusion amplification process. PQ-doped PMMA thus exhibits many properties which make it an ideal candidate as a high-density read-only holographic data storage medium.

  • characterization of Phenanthrenequinone doped poly methyl methacrylate for holographic memory
    Optics Letters, 1998
    Co-Authors: Gregory J Steckman, Iouri Solomatine, Gan Zhou, Demetri Psaltis
    Abstract:

    The holographic recording characteristics of Phenanthrenequinone- (PQ-) doped poly(methyl methacrylate) are investigated. The exposure sensitivity is characterized for single-hologram recording, and the M/# is measured for samples as thick as 3 mm. Optically induced birefringence is observed in this material.

  • Multiple hologram recording in a photopolymer with induced birefringence
    Technical Digest. Summaries of Papers Presented at the Conference on Lasers and Electro-Optics. Conference Edition. 1998 Technical Digest Series Vol.6, 1998
    Co-Authors: Gregory J Steckman, G. Zhou, Iouri Solomatine, Demetri Psaltis
    Abstract:

    Summary form only given. Polymer-based holographic recording materials are promising media for data storage applications. Among these, poly(methylmethacrylate) (PMMA)-based materials have a long history. We present new results with one such material, consisting of PMMA with Phenanthrenequinone (PQ) molecules. Specifically, the suitability of this material for holographic data storage will be discussed, as well as characterization of a novel optically induced birefringence.

  • A birefringent polymer for holographic recording
    Nonlinear Optics '98. Materials Fundamentals and Applications Topical Meeting (Cat. No.98CH36244), 1998
    Co-Authors: Gregory J Steckman, G. Zhou, Iouri Solomatine, Demetri Psaltis
    Abstract:

    Polymer based holographic recording materials are promising media for data storage applications. Among these, PMMA based materials have a long history. We present new results with one such material, consisting of PMMA with Phenanthrenequinone (PQ) molecules. Specifically, the suitability of this material for holographic data storage will be discussed as well as applications to optical correlation systems.