Browsing Electrical, Electronic and Communications Engineering Research Collection by Author "Close, Ciara E."

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Browsing Electrical, Electronic and Communications Engineering Research Collection by Author

Browsing Electrical, Electronic and Communications Engineering Research Collection by Author "Close, Ciara E."

Now showing items 1-12 of 12

The approximate model for holographic grating formation in photopolymers

Close, Ciara E. ; Gleeson, M. R. ; Kelly, John V. ; Sheridan, John T. (Optical Society of America, 2006-10-10)

Nonlocal Polymerisation Driven Diffusion model describes grating formation in photopolymer materials and gives valuable insight into the processes taking place during formation. For weak exposures, NPDD reduces to a ...
Effects of absorption and inhibition during grating formation in photopolymer materials

Gleeson, M. R. ; Kelly, John V. ; Close, Ciara E. ; O'Neill, Feidhlim T. ; Sheridan, John T. (Optical Society of America, 2006-10-01)

Photopolymer materials are practical materials for use as holographic recording media, as they are inexpensive and self-processing (dry processed). Understanding the photochemical mechanisms present during recording in ...
Generalized model of photopolymer behavior for use in optimized holographic data storage scheduling algorithms

Kelly, John V. ; Gleeson, M. R. ; Close, Ciara E. ; O'Neill, Feidhlim T. ; Sheridan, John T. (Optical Society of America, 2006-10-10)

A generalized model of photo-polymerization in free radical chainforming polymers has been developed. Applying this model to data storage, optimized scheduling algorithms are developed for the multiplexing of multiple ...
Holographic grating evolution in photopolymer materials

Gleeson, M. R. ; Kelly, John V. ; Close, Ciara E. ; Sabol, Dušan ; Sheridan, John T. (Optical Society of America, 2007-05-20)

A generalized non-local polymerization driven diffusion (NPDD) model is presented, including the effects of absorption and inhibition. Experimentally obtained growth curves are fit using a four-harmonic numerical fitting ...
Improvement of the spatial frequency response of photopolymer materials by modifying polymer chain length

Gleeson, M. R. ; Sabol, Dušan ; Liu, Shui ; Close, Ciara E. ; Kelly, John V. ; Sheridan, John T. (Optical Society of America, 2008-03-01)

One of the key predictions of the nonlocal photopolymerization driven diffusion (NPDD) model is that a reduction in the extent of the nonlocal effects within a material will improve the high spatial frequency response. The ...
Material kinetics during fabrication of holographic gratings in acrylamide-based photopolymer

Close, Ciara E. ; Kelly, John V. ; Gleeson, M. R. ; O'Neill, Feidhlim T. ; Sheridan, John T. (Optical Society of America, 2005-10-16)

We describe holographic grating formation in Acrylamide-based photopolymer material using the NonLocal Diffusion Driven model & discuss radical suppression leading to an inhibition period before grating growth. Diffusion ...
Modeling the photochemical effects present during holographic grating formation in photopolymer materials

Gleeson, M. R. ; Kelly, John V. ; Sabol, Dušan ; Close, Ciara E. ; Liu, Shui ; Sheridan, John T. (American Institute of Physics, 2007-07-26)

The development of a theoretical model of the processes present during the formation of a holographic grating in photopolymer materials is crucial in enabling further development of holographic applications. To achieve ...
Monomer diffusion rates in photopolymer material : Part II High-frequency gratings and bulk diffusion

Close, Ciara E. ; Gleeson, M. R. ; Mooney, Damian A. ; Sheridan, John T. (Optical Society of America, 2011-04-01)

Photosensitive polymers are of practical importance, and mass transport within such materials plays a critical role in their behavior. Building on the work in Part I [J. Opt. Soc. Am. B doc. ID 136413 (posted 5 January ...
Monomer diffusion rates in photopolymer material. Part I. Low spatial frequency holographic gratings

Close, Ciara E. ; Gleeson, M. R. ; Sheridan, John T. (Optical Society of America, 2011-03-01)

For photopolymers, knowing the rate of diffusion of the active monomer is important when modeling the material evolution during recording in order to understand and optimize their performance. Unfortunately, a confusingly ...
Monomer diffusion rates in photopolymer material: Part I. Low spatial frequency holographic gratings: reply

Sheridan, John T. ; Gleeson, M. R. ; Close, Ciara E. (Optical Society of America, 2012-03)

In [1,2] an error (by a factor of 1000) in the diffusion rate of monomer in a photopolymer material used by the authors of [3], is presented. In [3] no errors are identified in our analysis and our physical evidence is not ...
Temporal analysis of grating formation in photopolymer using the nonlocal polymerization-driven diffusion model

Kelly, John V. ; Gleeson, M. R. ; Close, Ciara E. ; O'Neill, Feidhlim T. ; Sheridan, John T. ; Gallego, Sergi ; Neipp, Cristian (Optical Society of America, 2005-09-05)

The nonlocal polymerization-driven diffusion model (NPDD) has been shown to predict high spatial frequency cut-off in photopolymers and to accurately predict higher order grating components. We propose an extension ...
Temporal response and first order volume changes during grating formation in photopolymers

Kelly, John V. ; Gleeson, M. R. ; Close, Ciara E. ; O'Neill, Feidhlim T. ; Sheridan, John T. ; Gallego, Sergi ; Neipp, Cristian (American Institute of Physics, 2006-06)

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 ...