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Proceedings Paper

Impact of inhibitor diffusion in holographic photopolymers
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Paper Abstract

Holographic photopolymers develop permanent index change via the polymerization and subsequent diffusion of monomer. It is well-known that to achieve high-fidelity recording, the rate of polymerization must be small in comparison to the rate of diffusion, particularly for strong exposures that consume significant fractions of the available monomer. When this condition is violated, polymerization is slowed in high-intensity regions by the local depletion of monomer, resulting in broadening of recorded features. This paper shows that a diffusing inhibitor has analogous dynamics controlled by the ratio of inhibitor diffusion rate to inhibition rate. When the ratio is small, inhibitor is locally depleted in bright regions, resulting in localized acceleration of polymerization. This causes recorded index features to be narrower than the incident optical exposure. Theoretical, numerical and experimental studies are used to illustrate this fact and show that this narrowing can be used to compensate for the broadening caused by monomer dynamics. Both effects are emphasized for rapid, strong recordings, suggesting that an inhibitor may be used to increase recording fidelity in this limit.

Paper Details

Date Published: 17 October 2007
PDF: 7 pages
Proc. SPIE 6657, Organic 3D Photonics Materials and Devices, 665703 (17 October 2007); doi: 10.1117/12.740794
Show Author Affiliations
Robert R. McLeod, Univ. of Colorado, Boulder (United States)
Matthew W. Grabowski, Univ. of Colorado, Boulder (United States)
Michael C. Cole, InPhase Technologies (United States)

Published in SPIE Proceedings Vol. 6657:
Organic 3D Photonics Materials and Devices
Susanna Orlic; Klaus Meerholz, Editor(s)

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