Adjusted intensity nonlocal diffusion model of photopolymer grating formation
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|Title:||Adjusted intensity nonlocal diffusion model of photopolymer grating formation||Authors:||Lawrence, Justin R.
O'Neill, Feidhlim T.
Sheridan, John T.
|Permanent link:||http://hdl.handle.net/10197/3459||Date:||1-Apr-2002||Online since:||2012-01-30T14:57:42Z||Abstract:||Diffusion-based models of grating formation in photopolymers have been proposed in which the rate of monomer polymerization (removal) is directly proportional to the illuminating intensity inside the medium. However, based on photochemical considerations, the rate of polymerization is proportional in the steady state to the square root of the interference intensity. Recently it was shown that, by introducing a nonlocal response function into the one-dimensional diffusion equation that governs holographic grating formation in photopolymers, one can deduce both high-frequency and low-frequency cutoffs in the spatial-frequency response of photopolymer materials. Here the ﬁrst-order nonlocal coupled diffusion equations are derived for the case of a general relationship between the rate of polymerization and the exposing intensity. Assuming a twoharmonic monomer expansion, the resultant analytic solutions are then used to ﬁt experimental growth curves for gratings fabricated with different spatial frequencies. Various material parameters, including monomer diffusion constant D and nonlocal variance s, are estimated.||Funding Details:||Not applicable||Type of material:||Journal Article||Publisher:||Optical Society of America||Journal:||Journal of the Optical Society of America B||Volume:||19||Issue:||4||Start page:||621||End page:||629||Copyright (published version):||2002 Optical Society of America||Subject LCSH:||Diffraction gratings
Holographic storage devices (Computer science)
|DOI:||10.1364/JOSAB.19.000621||Other versions:||http://dx.doi.org/10.1364/JOSAB.19.000621||Language:||en||Status of Item:||Not peer reviewed|
|Appears in Collections:||Electrical and Electronic Engineering Research Collection|
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