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Proceedings Paper

Optimisation and coupling of high-performance photocyclic initiating systems for efficient holographic materials (Conference Presentation)
Author(s): Christian Ley; Christian Carré; Ahmad Ibrahim; Xavier Allonas

Paper Abstract

For fabrication of diffractive optical elements or for holographic data storage, photopolymer materials have turned out to be serious candidates, taking into account their performances such as high spatial resolution, dry processing capability, ease of use, high versatility. From the chemical point of view, several organic materials are able to exhibit refractive index changes resulting from polymerization, crosslinking or depolymerization, such as mixtures of monomers with several reactive functions and oligomers, associated to additives, fillers and to a photoinitiating system (PIS).

In this work, the efficiencies of two and three component PIS as holographic recording materials are analyzed in term of photopolymerization kinetics and diffraction yield. The selected systems are based on visible dyes, electron donor and electron acceptor. In order to investigate the influence of the photophysical properties of dye on the holographic recording material performance time resolved and steady state spectroscopic studies of the PIS are presented. This detailed photochemical studies of the PIS outline the possible existence of photocyclic initiating systems (PCIS) where the dye is regenerated during the chemical process. Simultaneously, these visible systems are associated to fluorinated acrylate monomers for the recording of transmission gratings. To get more insight into the hologram formation, gratings’ recording curves were compared to those of monomer to polymer conversion obtained by real time Fourier transform infrared spectroscopy. This work outlines the importance of the coupling of the the photochemical reactions and the holographic resin. Moreover the application of the PCIS in holographic recording outlines the importance of the photochemistry on final holographic material properties: here a sensitive material with high diffraction yield is described. Indeed, this work outlines the importance of the coupling between the photochemistry underlying the radicals photogeneration and the holographic resin.

Paper Details

Date Published: 19 June 2017
PDF: 1 pages
Proc. SPIE 10233, Holography: Advances and Modern Trends V, 102330J (19 June 2017); doi: 10.1117/12.2264967
Show Author Affiliations
Christian Ley, Univ. de Haute Alsace (France)
Christian Carré, Ecole Nationale Supérieure des Sciences Appliquées et de Technologie (France)
Ahmad Ibrahim, Univ. de Haute Alsace (France)
Xavier Allonas, Univ. de Haute Alsace (France)

Published in SPIE Proceedings Vol. 10233:
Holography: Advances and Modern Trends V
Miroslav Hrabovský; John T. Sheridan; Antonio Fimia, Editor(s)

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