Prof. Gabriel M. Crean Profile

Prof. Gabriel M. Crean

at Tyndall National Institute

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Author

Publications (4)

Proceedings Article | 22 February 2008 Paper

Beam shaping effects in two photon polymerization of hybrid material systems

Richard Winfield, Belal Bhuian, Shane O'Brien, Gabriel Crean

Proceedings Volume 6880, 688002 (2008) https://doi.org/10.1117/12.766234

KEYWORDS: Two photon polymerization, Diffractive optical elements, Axicons, Polymers, Sol-gels, Diffraction gratings, Beam shaping, Beam delivery, Objectives, Polymerization

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Proceedings Article | 11 March 2005 Paper

Polymer materials science and processing technologies for planar lightwave circuit manufacture

Shane O'Brien, Gareth Redmond, Gabriel Crean, Jan Krueger, Georg Von Papen

Proceedings Volume 5731, (2005) https://doi.org/10.1117/12.591542

KEYWORDS: Waveguides, Polymers, Refractive index, Polymer multimode waveguides, Reliability, Ultraviolet radiation, Epoxies, Sol-gels, Optics manufacturing, Optical interconnects

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Two polymer technology platforms incorporating both polymer-based materials and UV-assisted and hot embossing fabrication processes have been developed for planar optical waveguiding applications. Firstly, a novel hybrid organic-inorganic (sol-gel) materials system with epoxy functionality has been developed for use in short-range optical interconnect applications. The sol-gel material can be easily formulated and deposited by spin or dip coating to form layers of up to 25μm in thickness. The resulting film can be selectively cross-linked using photo-lithography, as part of a UV-Thermal curing process. The basic refractive index of as-deposited layers can be adjusted between 1.48 and 1.515 by modifying the concentration of DPDMS present. The near-field image of transmitted radiation (633nm) demonstrated waveguiding and efficient light confinement within the UV-thermally produced core regions. Preliminary Telcordia reliability testing indicates that the hybrid material waveguides have good thermo-mechanical stability and meet the requirements for central office (CO) operation. This represents a significant improvement in thermal stability over previous inorganic-organic hybrid waveguide materials systems containing acrylate or methacrylate groups that are easily cured by thermal processes. Secondly, an imprint embossing process has been developed for fabrication of all polymer waveguiding components enabling simultaneous embossing of both waveguide and optical fibre alignment grooves. Optimised pairings of polymer materials for the substrate of the device, into which the waveguide grooves are imprinted, and the core, which provides the refractive index step necessary for guiding light through the device, have been identified and evaluated. Insertion loss measurements were performed at 850 and 1330nm using the cleave-back method and were found to be 0.4dB cm^-1 and 0.7 dB cm^-1 respectively. The measured waveguide loss from the optimised devices at 850nm after thermal reliability testing was 1.0dB/cm. These measurements indicate that polymer optical waveguides manufactured using this embossing process will satisfy several envisaged optical interconnect datacom applications.

Proceedings Article | 27 August 2003 Paper

Thermal reliability studies of optoelectronic components

Padraig Hughes, Ger Healy, Xavier Llinares, Mahbub Akhter, J. Justice, Shane O'Brien, John Alderman, Gabriel Crean

Proceedings Volume 4876, (2003) https://doi.org/10.1117/12.476005

KEYWORDS: Reliability, Avalanche photodetectors, Vertical cavity surface emitting lasers, Optoelectronic devices, Temperature metrology, Phase only filters, Waveguides, Light emitting diodes, Standards development, Sol-gels

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Proceedings Article | 10 April 1995 Paper

Characterization of excimer lamp photo-deposited ultrathin oxynitride films

S. Lynch, Gerard O'Connor, Gabriel Crean, J. Zhang, Zsolt Geretovszky, Philippe Bergonzo, Ian Boyd

Proceedings Volume 2403, (1995) https://doi.org/10.1117/12.206261

KEYWORDS: Silicon, Silicon films, Thin films, Lamps, FT-IR spectroscopy, Refractive index, Excimers, Absorption, Spectroscopy, Spectroscopic ellipsometry

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