Photopolymer materials for holographic data storage applications

Abstract

Photopolymer materials are practical materials for use as holographic recording media, as they are inexpensive and self-processing. By understanding the mechanisms present during recording in these materials their limitations for certain processes can be improved and a more efficient, environmentally stable material can be produced. In this paper we briefly review the application of photopolymer materials in the area of holographic data storage. In particular we discuss the recent development of the Non-local Polymerisation Driven Diffusion Model, (NPDD) including absorption and inhibition, and analysis of the photochemical effects present during the evolution of holographic grating formation. The inclusion of these effects allows a more accurate understanding of the photo-polymerisation process.

Monomer diffusion rates in photopolymer material Part II High-frequency gratings and bulk diffusion

“…Estimates ranging from 10 −7 to 10 −14 cm 2 =s have been reported by different groups (see [2][3][4][5][6][7]). The many applications of such free-radical photopolymer materials [8][9][10][11][12][13] make understanding the material photokinetics very important.…”

“…The many applications of such free-radical photopolymer materials [8][9][10][11][12][13] make understanding the material photokinetics very important. The material behavior appears to be best described using diffusion-based models, i.e., the nonlocal polymerization-driven diffusion (NPDD) model [2,[14][15][16]. In this model, it is assumed that, because of crosslinking, only monomer diffusion is significant postexposure.…”

Nonlocal photopolymerization kinetics including multiple termination mechanisms and dark reactions Part I Modeling

“…For visibility V = 1 and nonlinearity parameter ␥ = 1 2 , the polymerization rate was represented by a Fourier series [41].…”

The Approximate Model for Holographic Grating Formation in Photopolymers

“…From this, assuming very short exposure, i.e. ξ<<0.1, the higher order terms can be neglected and we have [4]: [ 2 ] where u 0 (0) is initial monomer concentration, f 1 is a Fourier coefficient and S 1 is the nonlocal parameter.…”