Temporal response and first order volume changes during grating formation in photopolymers
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Título: | Temporal response and first order volume changes during grating formation in photopolymers |
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Autor/es: | Kelly, John V. | Gleeson, Michael R. | Close, Ciara E. | O'Neill, Feidhlim T. | Sheridan, John T. | Gallego, Sergi | Neipp, Cristian |
Grupo/s de investigación o GITE: | Holografía y Procesado Óptico |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal | University College Dublin. Department of Electronic and Electrical Engineering |
Palabras clave: | Holography | Holographic recording materials | Volome holograms | Photopolymers |
Área/s de conocimiento: | Física Aplicada | Óptica |
Fecha de creación: | 9-feb-2006 |
Fecha de publicación: | 1-jun-2006 |
Editor: | American Institute of Physics |
Cita bibliográfica: | KELLY, John V., et al. "Temporal response and first order volume changes during grating formation in photopolymers". Journal of Applied Physics. Vol. 99, No. 11 (2006). ISSN 0021-8979, pp. 113105-1/7 |
Resumen: | We examine the evolution of the refractive index modulation when recording gratings in an acrylamide based photopolymer. A nonlocal diffusion model is used to predict theoretically the grating evolution. The model has been developed to account for both nonlocal spatial and temporal effects in the medium, which can be attributed to polymer chain growth. Previously it was assumed that the temporal effect of chain growth could be neglected. However, temporal effects due to chain growth and monomer diffusion are shown to be significant, particularly over short recording periods where dark field amplification is observed. The diffusion model is solved using a finite-difference technique to predict the evolution of the monomer and polymer concentrations throughout grating recording. Using independently measured refractive index values for each component of the recording medium, the Lorentz-Lorenz relation is used to determine the corresponding refractive index modulation. The corresponding diffraction efficiency is then determined using rigorous coupled wave analysis. The diffraction efficiency curves are presented for gratings recorded using short exposure times, monitored in real time, both during and after recording. The effect of volume shrinkage of polymer on grating evolution is also examined. Both the nonlocal temporal response of the material and monomer diffusion are shown to influence refractive index modulation postexposure. |
Patrocinador/es: | Enterprise Ireland and Science Foundation Ireland through the Research Innovation Fund, the Basic Research Program and the Research Frontiers Program and of the Irish Research Council for Science, Engineering and Technology. |
URI: | http://hdl.handle.net/10045/9609 |
ISSN: | 0021-8979 (Print) | 1089-7550 (Online) |
DOI: | 10.1063/1.2200400 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | Copyright 2006 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1063/1.2200400 |
Aparece en las colecciones: | INV - GHPO - Artículos de Revistas |
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