Holographic Recording by Dye-Sensitized Photopolymerization of Acrylamide

Abstract

The dye-sensitized photopolymerization of acrylamide was investigated in order to obtain new holographic recording media that have high diffraction efficiency and a long photosensitive life. The characteristics of the photosensitive system, containing methylene blue as a photosensitizer and acetylacetone or triethanolamine as an initiator, were estimated. In the system containing the former initiator, the existence of bases was found to be essential and a 20% diffraction efficiency was obtained. In the system containing the latter initiator, a diffraction efficiency of up to 65% was obtained and the photosensitivity was maintained more than 80 days.

Effects of absorption and inhibition during grating formation in photopolymer materials

“…In particular we note that our use of a step function to model the inhibition period must be reexamined. However, given the variety of material in which inhibition effects 23,34 and threshold effects 35 have been observed, even the incomplete results presented here are significant for a wide range of applications, including holographic data storage, [36][37][38] diffractive optical element fabrication, [39][40][41] and photoembossing. …”

Silver-doped photopolymer media for holographic recording

“…Often the recorded gratings were stabilized by postexposure techniques such as UV curing, incoherent or coherent illumination, and thermal treatment. Incorporation of different additives into these films was also tried by several research groups to improve their storage lives, of which incorporation of metal ions was reported to be the best since metal ions formed ionic cross links with the poly(vinyl alcohol) (PVA) matrix, thereby inhibiting the diffusion of unreacted monomers and stabilizing the recorded grating [7][8][9][10][11][12]. Metal-ion-doped polymers have made a significant impact in holography due to their great advantages such as real-time image development, self-processing, high photosensitivity, and low cost.…”

“…Though high DE was achieved in these films, the energy sensitivity was very low. Sugakewa et al devised a photosensitive liquid system with a mixture of acrylamide (AA) and methylene bisacrylamide coupled with ferric ion and tert-butyl hydroperoxide sensitive from 200 to 500 nm that exhibited a high DE of ≈80% [10]. However, in this system, holograms have been recorded in liquid phase, the photosensitive liquid being encapsulated between two glass plates separated by a spacer and later fixed by an overall ultraviolet exposure.…”

Study on the optimization of cationic ring opening polymerization of silicone-based epoxy monomers for holographic photopolymers

“…Since then numerous systems based on acrylic-type monomers have been examined. [4][5][6] Among them, the family of acrylate-based system known as Omnidex series [7][8][9] is generally considered to be the best commercially available materials for holographic recording at this time because of their high diffraction efficiency (DE), high sensitivity and good resolution. 10 However, the change in Bragg detuning caused by volume reduction, which is accompanied by the polymerization of acrylic monomers upon exposure, has not been prevented.…”