Dr. Michael R. Gleeson Profile

Dr. Michael R. Gleeson

SPIE Involvement:

Author

Publications (48)

Proceedings Article | 26 September 2013 Paper

Spatial frequency response of AA/PVA photopolymer material containing four different photosensitizers

Yue Qi, Haoyu Li, Jinxin Guo, Michael Gleeson, John Sheridan

Proceedings Volume 8855, 88550R (2013) https://doi.org/10.1117/12.2029559

KEYWORDS: Spatial frequencies, Refractive index, Modulation, Diffusion, Holography, Photopolymers, Diffraction, Diffraction gratings, Communication engineering, Absorption

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Proceedings Article | 26 September 2013 Paper

Theoretical and experimental examination of PQ-PMMA photopolymer material

Yue Qi, Haoyu Li, Elen Tolstik, Jinxin Guo, Michael Gleeson, Vladislav Matusevich, Richard Kowarschik, John Sheridan

Proceedings Volume 8855, 88550Q (2013) https://doi.org/10.1117/12.2029489

KEYWORDS: Diffusion, Modulation, Molecules, Refractive index, Data modeling, Photopolymers, Absorption, Polymethylmethacrylate, Diffraction gratings, Holography

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Proceedings Article | 8 May 2013 Paper

Investigations of the behavior for PQ-PMMA material post-exposure

Yue Qi, Haoyu Li, Elen Tolstik, Jinxin Guo, Michael Gleeson, Vladislav Matusevich, Richard Kowarschik, John Sheridan

Proceedings Volume 8776, 877606 (2013) https://doi.org/10.1117/12.2018243

KEYWORDS: Diffusion, Refractive index, Modulation, Molecules, Diffraction, Polymethylmethacrylate, Photopolymers, Holography, Communication engineering, Diffraction gratings

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Proceedings Article | 3 May 2013 Paper

Analysis of the effects of viscosity, volume, and temperature in photopolymer material for holographic applications

Jinxin Guo, Michael Gleeson, John Sheridan

Proceedings Volume 8776, 87760J (2013) https://doi.org/10.1117/12.2018330

KEYWORDS: Diffusion, Polymers, Polymerization, Photopolymers, Molecules, Oxygen, Holography, Differential equations, Free space, Refractive index

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Proceedings Article | 3 May 2013 Paper

Investigation of the electromagnetic behavior of AA/PVA based photopolymer material

Haoyu Li, Yue Qi, Jinxin Guo, Michael Gleeson, John Sheridan

Proceedings Volume 8776, 87760M (2013) https://doi.org/10.1117/12.2018333

KEYWORDS: Electromagnetism, Photopolymers, Molecules, Dielectrics, Information operations, Numerical simulations, Transmittance, Photons, Radio propagation, Polymers

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Proceedings Article | 5 May 2012 Paper

Investigations of photosensitizers in an AA/PVA-based photopolymer material

Yue Qi, Michael Gleeson, Jinxin Guo, John Sheridan

Proceedings Volume 8429, 842921 (2012) https://doi.org/10.1117/12.923120

KEYWORDS: Absorption, Molecules, Photopolymers, Polymers, Holography, Polymerization, Systems modeling, Materials processing, Refractive index, Modulation

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Proceedings Article | 5 May 2012 Paper

Kinetics of chain transfer agents in photopolymer material

Jinxin Guo, Michael Gleeson, John Sheridan

Proceedings Volume 8429, 84291A (2012) https://doi.org/10.1117/12.922653

KEYWORDS: Polymerization, Polymers, Diffusion, Scanning probe lithography, Photopolymers, Molecules, Spatial frequencies, Oxygen, Holography, Refractive index

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Proceedings Article | 28 April 2012 Paper

Recent developments in the NPDD model

Michael Gleeson, Jinxin Guo, John Sheridan

Proceedings Volume 8429, 84291C (2012) https://doi.org/10.1117/12.922643

KEYWORDS: Polymers, Diffusion, Polymerization, Oxygen, Molecules, Differential equations, Holography, Photopolymers, Free space, Carbon

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Proceedings Article | 11 May 2011 Paper

NPDD model: a tool for photopolymer enhancement

Michael Gleeson, Jinxin Guo, Shui Liu, John Sheridan

Proceedings Volume 8074, 807407 (2011) https://doi.org/10.1117/12.898610

KEYWORDS: Oxygen, Polymers, Ferroelectric materials, Diffusion, Modulation, Refractive index, Photopolymers, Data modeling, Holography, Differential equations

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Proceedings Article | 11 May 2011 Paper

Theoretical and experimental analysis of chain transfer agents behaviors in photopolymer material

Jinxin Guo, Michael Gleeson, Shui Liu, John Sheridan

Proceedings Volume 8074, 80740G (2011) https://doi.org/10.1117/12.886933

KEYWORDS: Polymers, Spatial frequencies, Diffusion, Data modeling, Refractive index, Photopolymers, Sodium, Modulation, Holography, Polymerization

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Proceedings Article | 11 May 2011 Paper

Spectral study of irgacure 784 dye in an epoxy resin photopolymer

Dušan Sabol, Milica Sabolová, Michael Gleeson, John Sheridan

Proceedings Volume 8074, 80740H (2011) https://doi.org/10.1117/12.890309

KEYWORDS: Absorbance, Epoxies, Sodium, Absorption, Holography, Photopolymers, Ultraviolet radiation, Refractive index, Molecules, Visible radiation

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SPIE Journal Paper | 1 January 2011

Study of photosensitizer diffusion in a photopolymer material for holographic applications

Jinxin Guo, Shui Liu, Michael Gleeson, John Sheridan

OE, Vol. 50, Issue 01, 015801, (January 2011) https://doi.org/10.1117/12.10.1117/1.3526686

KEYWORDS: Diffusion, Holography, Photopolymers, Data modeling, Absorption, Molecules, Holography applications, Optical engineering, Holographic materials, Chemical analysis

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Proceedings Article | 15 May 2010 Paper

Experimental study of primary radical generation in polyvinylalcohol/acrylamide (PVA/AA) based photopolymer material

Shui Liu, Michael Gleeson, Jinxin Guo, John Sheridan

Proceedings Volume 7717, 77171J (2010) https://doi.org/10.1117/12.854577

KEYWORDS: Molecules, Absorption, Photopolymers, Holography, Oxygen, Data modeling, Modulation, Molecular energy transfer, Optoelectronics, Refractive index

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Proceedings Article | 15 May 2010 Paper

Using short exposures to approximate diffusion rates

C. Close, M. Gleeson, J. Sheridan

Proceedings Volume 7717, 77171O (2010) https://doi.org/10.1117/12.854985

KEYWORDS: Diffusion, Polymers, Diffraction gratings, Diffraction, Modulation, Refractive index, Holography, Polymerization, Holographic materials, Modeling

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Proceedings Article | 14 May 2010 Paper

Theoretical analysis and experimental validation of photosensitizer diffusion in a photopolymer material

Jinxin Guo, Shui Liu, Michael Gleeson, John Sheridan

Proceedings Volume 7717, 77170Y (2010) https://doi.org/10.1117/12.854527

KEYWORDS: Diffusion, Holography, Photopolymers, Data modeling, Absorption, Molecules, Transmittance, Chemical analysis, Photopolymerization, Optoelectronics

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Proceedings Article | 14 May 2010 Paper

Extracting parameters from slanted non-uniform gratings recorded in photopolymer

Dušan Sabol, Michael Gleeson, John Sheridan

Proceedings Volume 7717, 77171I (2010) https://doi.org/10.1117/12.854493

KEYWORDS: Diffraction gratings, Modulation, Diffraction, Refractive index, Absorption, Data modeling, Differential equations, Wave propagation, Holography, Polymerization

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Proceedings Article | 14 May 2010 Paper

Approximating monomer diffusion in the Raman-Nath regime

C. Close, M. Gleeson, J. Sheridan

Proceedings Volume 7717, 77170S (2010) https://doi.org/10.1117/12.854979

KEYWORDS: Diffusion, Diffraction gratings, Holography, Diffraction, Photopolymers, Volume holography, Refractive index, Modulation, Polymers, CCD cameras

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Proceedings Article | 19 May 2009 Paper

Non-local photopolymerization kinetics with multiple termination mechanisms and post-exposure effects

Michael Gleeson, Shui Liu, Dusan Sabol, John Sheridan

Proceedings Volume 7358, 73580O (2009) https://doi.org/10.1117/12.823401

KEYWORDS: Polymerization, Photopolymers, Polymers, Refractive index, Diffusion, Modulation, Oxygen, Holography, Absorption, Data modeling

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Proceedings Article | 19 May 2009 Paper

Improved model of the photo-initiation mechanisms in photopolymer materials

Shui Liu, Michael Gleeson, Dusan Sabol, John Sheridan

Proceedings Volume 7358, 73580Q (2009) https://doi.org/10.1117/12.820996

KEYWORDS: Molecules, Oxygen, Photopolymers, Holography, Photons, Absorption, Data modeling, Data storage, Molecular energy transfer, Transmittance

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Proceedings Article | 7 May 2009 Paper

Photokinetic study of Irgacure 784 dye in an epoxy resin photopolymer

Dusan Sabol, Michael Gleeson, Shui Liu, John Sheridan

Proceedings Volume 7358, 735804 (2009) https://doi.org/10.1117/12.820839

KEYWORDS: Absorption, Transmittance, Epoxies, Laser beam diagnostics, Holography, Data modeling, Refractive index, Molecules, Polymers, Quantum efficiency

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Proceedings Article | 25 April 2008 Paper

Improvement of photopolymer materials for holographic data storage

Michael Gleeson, Shui Liu, Ciara Close, Dusan Sabol, John Sheridan

Proceedings Volume 6994, 69940P (2008) https://doi.org/10.1117/12.781650

KEYWORDS: Diffusion, Refractive index, Polymers, Spatial frequencies, Modulation, Holography, Polymerization, Photopolymers, Oxygen, Data storage

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Proceedings Article | 25 April 2008 Paper

Examination of the photoinitiation processes in photopolymer materials

Shui Liu, Michael Gleeson, Sean O'Duill, John Sheridan

Proceedings Volume 6994, 69940O (2008) https://doi.org/10.1117/12.781649

KEYWORDS: Photopolymers, Absorption, Molecules, Transmittance, Holography, Electrons, Adaptive optics, Materials processing, Data modeling, Oxygen

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Proceedings Article | 27 September 2007 Paper

Photopolymer materials for holographic data storage applications

John Sheridan, Michael Gleeson, Ciara Close, Dusan Sabol

Proceedings Volume 6698, 669807 (2007) https://doi.org/10.1117/12.739044

KEYWORDS: Data storage, Holography, Dysprosium, Diffusion, Polymers, Photopolymers, Polymerization, Molecules, Spatial frequencies, Holographic materials

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Proceedings Article | 27 September 2007 Paper

Photopolymer material used in the recording of slanted gratings

Dusan Sabol, Michael Gleeson, Ciara Close, Shui Liu, John Sheridan

Proceedings Volume 6698, 66981G (2007) https://doi.org/10.1117/12.736901

KEYWORDS: Diffraction gratings, Modulation, Holography, Absorption, Photopolymers, Molecules, Electromagnetism, Diffusion, Quantum efficiency, Diffraction

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Proceedings Article | 11 July 2007 Paper

Holographic grating evolution in photopolymer materials

Michael Gleeson, John Sheridan

Proceedings Volume 6620, 66201Q (2007) https://doi.org/10.1117/12.739095

KEYWORDS: Polymerization, Molecules, Oxygen, Polymers, Diffusion, Holography, Data modeling, Absorption, Photopolymers, Modulation

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Proceedings Article | 13 September 2006 Paper

Impacts of modifier chemicals on the rates of diffusion in Acrylamide/PVA photopolymer

C. Close, M. Gleeson, J. Kelly, D. Mooney, J. Sheridan

Proceedings Volume 6335, 63350S (2006) https://doi.org/10.1117/12.681594

KEYWORDS: Diffusion, Polymers, Humidity, Data storage, Holographic data storage systems, Photopolymers, Spatial frequencies, Holography, Polymerization, Magnetism

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Proceedings Article | 13 September 2006 Paper

Optimized scheduling technique for holographic data storage

John Kelly, Michael Gleeson, Ciara Close, John Sheridan

Proceedings Volume 6335, 63350J (2006) https://doi.org/10.1117/12.682220

KEYWORDS: Diffraction, Diffraction gratings, Holography, Data storage, Polymers, Data modeling, Diffusion, Polymerization, Photopolymers, Refractive index

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Proceedings Article | 13 September 2006 Paper

Photochemical effects during holographic grating formation in photopolymer using the non-local polymerisation driven diffusion model

Michael Gleeson, Ciara Close, John Kelly, John Sheridan

Proceedings Volume 6335, 63350D (2006) https://doi.org/10.1117/12.681593

KEYWORDS: Polymerization, Polymers, Holography, Molecules, Diffusion, Absorbance, Oxygen, Photopolymers, Absorption, Transmittance

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Proceedings Article | 13 September 2006 Paper

Nonlocal polymerization driven diffusion model: volume changes during grating formation

John Kelly, Michael Gleeson, Ciara Close, John Sheridan

Proceedings Volume 6335, 63350Q (2006) https://doi.org/10.1117/12.680818

KEYWORDS: Refractive index, Polymers, Diffusion, Modulation, Polymerization, Neodymium, Data modeling, Photopolymers, Diffraction gratings, Holography

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Proceedings Article | 8 September 2006 Paper

Modeling photopolymers for holographic data storage applications

John Sheridan, John Kelly, Michael Gleeson, Ciara Close

Proceedings Volume 6343, 634332 (2006) https://doi.org/10.1117/12.707941

KEYWORDS: Refractive index, Polymers, Polymerization, Modulation, Diffusion, Data modeling, Photopolymers, Holography, Oxygen, Neodymium

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The Nonlocal Polymerization Driven Diffusion model, NPDD, is can be used to describe holographic grating formation in Acrylamide-based photopolymer. The free radical chain polymerization process results in polymer being generated nonlocal both in space and time to the point of chain initiation. Temporal nonlocality can be used to describepost exposure dark effects. Nonlinear response and the effects of dye bleaching have been examined. Both primary and bimolecular chain termination mechanisms have been included and examined. Recently 3-D, and inhibition effects have also been included. In this paper we review of our recent work. It is shown that temporal effects become most notable for short exposres and the inclusion of the nonlocal temporal response function is shown to be necessary to accurately describe the process. In particular, brief post exposure self-amplification of the refractive index modulation is noted. This is attributed to continued chain growth for a brief period after exposure. Following this a slight decay in the grating amplitude also occurs. This we believe is due to the continued diffusion of monomer after exposure. Since the sinusoidal recording pattern generates a monomer concentration gradient during the recording process monomer diffusion occurs both during and after exposure. The evolution of the refractive index modulation is determined by the respective refractive index values of the recording material components. From independent measurements it is noted that the refractive index value of the monomer is slightly less than that of the background material. Therefore as monomer diffuses back into the dark regions, a reduction in overall refractive index modulation occurs. Volume changes occurring within the material also affect the nature of grating evolution. To model these effects we employ a free volume concept. Due to the fact that the covalent single carbon bond in the polymer is up to 50% shorter than the van der Waals bond in the liquid monomer state, free volume is created when monomer is converted to polymer. For each bond conversion we assume a hole is generated which then collapses at some characteristic rate constant. The Lorentz-Lorenz relation is used to determine the overall evolution refractive index modulation and the corresponding diffraction efficiency of the resulting grating is calculated using Rigorous Coupled Wave Analysis (RCWA). The Lorentz-Lorenz relation is used to determine the overall evolution refractive index modulation and the corresponding diffraction efficiency of the resulting grating is calculated using Rigorous Coupled Wave Analysis (RCWA). Inhibition is typically observed at the start of grating growth during which the formation of polymer chains is suppressed. In this paper experiments are reported, carried out with the specific aim of understanding of these processes. The results support our description of the inhibition process in an PVA/Acrylamide based photopolymer and can be used to predict behaviour under certain conditions.

Proceedings Article | 9 June 2006 Paper

Examination of the temporal and kinetic effects in acrylamide based photopolymer using the nonlocal polymer driven diffusion model (NPDD)

John Kelly, Michael Gleeson, Feidhlim O'Neill, John Sheridan, Sergi Gallego, Cristian Neipp

Proceedings Volume 6252, 625207 (2006) https://doi.org/10.1117/12.676506

KEYWORDS: Diffusion, Polymers, Polymerization, Refractive index, Modulation, Holography, Diffraction gratings, Diffraction, Data modeling, Systems modeling

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Proceedings Article | 25 April 2006 Paper

Determination of diffusion rates in acrylamide-based photopolymer material

C. Close, M. Gleeson, J. Kelly, F. O'Neill, D. Mooney, J. Sheridan

Proceedings Volume 6187, 61871C (2006) https://doi.org/10.1117/12.663300

KEYWORDS: Diffusion, Polymers, Holography, Data storage, Molecules, Photopolymers, Modulation, Diffraction, Humidity, Refractive index

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Proceedings Article | 25 April 2006 Paper

Photochemical effects during fabrication of holographic gratings in acrylamide-based photopolymer materials

Michael Gleeson, Ciara Close, John Kelly, Feidhlim O'Neill, John Sheridan

Proceedings Volume 6187, 61871D (2006) https://doi.org/10.1117/12.663408

KEYWORDS: Polymerization, Holography, Oxygen, Diffusion, Polymers, Transmittance, Photopolymers, Absorption, Molecules, Plating

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Proceedings Article | 20 April 2006 Paper

Analysis of the temporal effects on grating evolution in photopolymer

John Kelly, Michael Gleeson, Ciara Close, Feidhlim O' Neill, John Sheridan, Sergi Gallego, Cristian Neipp

Proceedings Volume 6187, 618704 (2006) https://doi.org/10.1117/12.663444

KEYWORDS: Refractive index, Polymers, Diffusion, Modulation, Polymerization, Data modeling, Neodymium, Holography, Finite-difference time-domain method, Diffraction

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The nonlocal polymerization driven diffusion model is used to describe holographic grating formation in acrylamidebased photopolymer. The free radical chain polymerization process results in polymer being generated nonlocal both in space and time to the point of chain initiation. A Gaussian spatial material response function and an exponential temporal material response function are used to account for these effects. In this paper we firstly examine the nature of the temporal evolution of grating formation for short recording periods. It is shown that in this case, temporal effects become most notable and the inclusion of the nonlocal temporal response function is shown to be necessary to accurately describe the process. In particular, brief post exposure selfamplification of the refractive index modulation is noted. This is attributed to continued chain growth for a brief period after exposure. Following this a slight decay in the grating amplitude also occurs. This we believe is due to the continued diffusion of monomer after exposure. Since the sinusoidal recording pattern generates a monomer concentration gradient during the recording process monomer diffusion occurs both during and after exposure. The evolution of the refractive index modulation is determined by the respective refractive index values of the recording material components. From independent measurements it is noted that the refractive index value of the monomer is slightly less than that of the background material. Therefore as monomer diffuses back into the dark regions, a reduction in overall refractive index modulation occurs. Volume changes occurring within the material also affect the nature of grating evolution. To model these effects we employ a free volume concept. Due to the fact that the covalent single carbon bond in the polymer is up to 50% shorter than the van der Waals bond in the liquid monomer state, free volume is created when monomer is converted to polymer. For each bond conversion we assume a hole is generated which then collapses at some characteristic rate constant. Incorporating each of these effects into our model, the model is then solved using a Finite-Difference Time- Domain method (FDTD). The Lorentz-Lorenz relation is used to determine the overall evolution refractive index modulation and the corresponding diffraction efficiency of the resulting grating is calculated using Rigorous Coupled Wave Analysis (RCWA). Fits are then carried out to experimental data for 1 second exposures. Good quality fits are achieved and material parameters extracted. Monomer diffusion rates are determined to be of the order of D ~ 10^-10 cm^2/s and the time constant of the nonlocal material temporal response function being of the order of τ_n ~ 10^-2s. Material shrinkage occurring over these recording periods is also determined.

Proceedings Article | 1 September 2005 Paper

The effects of inhibition during grating formation in photopolymer materials

M. Gleeson, J. Kelly, C. Close, F. O'Neill, J. Sheridan

Proceedings Volume 5939, 59390R (2005) https://doi.org/10.1117/12.617675

KEYWORDS: Oxygen, Polymerization, Polymers, Diffusion, Photopolymers, Transmittance, Holography, Absorbance, Differential equations, Molecules

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Proceedings Article | 1 September 2005 Paper

Diffusion rates in non-local photopolymer materials

C. Close, M. Gleeson, F. O'Neill, J. Kelly, D. Mooney, J. Sheridan

Proceedings Volume 5939, 59390Q (2005) https://doi.org/10.1117/12.617639

KEYWORDS: Diffusion, Polymers, Modulation, Photopolymers, Water, Refractive index, Diffraction, Humidity, Spatial frequencies, Diffraction gratings

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Proceedings Article | 1 September 2005 Paper

Investigation of the temporal response and volume changes occurring during grating formation in photopolymer

John Kelly, Michael Gleeson, Ciara Close, Feidhlim O'Neill, John Sheridan

Proceedings Volume 5939, 59390J (2005) https://doi.org/10.1117/12.617272

KEYWORDS: Refractive index, Polymers, Modulation, Diffusion, Polymerization, Neodymium, Diffraction gratings, Diffraction, Holography, Finite-difference time-domain method

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Proceedings Article | 25 August 2005 Paper

Micro-optical elements produced using an photo-embossing technique in photopolymers

Feidhlim O'Neill, Ita Rowsome, Alun Carr, Stephen Daniels, Michael Gleeson, John Kelly, Ciara Close, Justin Lawrence, John Sheridan

Proceedings Volume 5872, 587209 (2005) https://doi.org/10.1117/12.617734

KEYWORDS: Polymers, Photopolymers, Polymerization, X-rays, Diffusion, Optical components, Holography, Absorption, Fabrication, Process modeling

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