JTS was born in Castlebar, Co. Mayo, Ireland, where he attended St Patricks National School and St Geralds College. He received his Bachelors degree (H1) in Electronic Engineering, from University College Galway (NUIG/UCG) in 1985, and his Masters degree in the Science of Electrical Engineering, from Georgia Tech, in 1986. While at GT he worked as a Research Assistant of Prof. William T. Rhodes. In 1987 he matriculated as a member of Jesus College Oxford and in 1991 he was awarded his doctorate by Oxford University for work carried out under the supervision of Prof. Laszlo Solymar and Prof. Colin J. R. Sheppard.
This was followed by postdoctoral research fellowships, supported first (1991) by the Alexander von Humboldt Foundation and later (1992) by a European Community Bursary. Both were held at the Lehrstuhl fur Angewandte Optik in Erlangen-Nürnberg University, under the leadership of Prof. Dr A. W. Lohmann. In 1994 he took up a position as a visiting scientist at the European Commission Joint Research Centre, in Italy. In 1997 he was appointed to the School of Physics, Dublin Institute of Technology as a permanent lecturer.
He joined the School of Electrical and Electronic Engineering, University College Dublin (UCD), in 2000 as a College Lecturer. In 2005 he became a Senior Lecturer, and in 2007 Prof. of Optical Engineering. He coordinates the Masters Degree in Optical Engineering. He has supervised >20 PhDs to completion in UCD.
He has authored >400 widely cited papers (ISI Web of Science: h~40 & Google Scholar: h~47).
He regularly serves on international conference, award and review committees and is a member of the editorial boards of several peer reviewed journals.
In 2006 he co-founded Generic Light, in 2013 Equilume Ltd. and in 2016 BRS-optics.
He is fellow of: SPIE (2014), OSA (2016), FIMA (2018).
John is married to the very wonderful Dr Jutta Baum-Sheridan and is the extremely proud father of M. Daniel O. Sheridan.
This was followed by postdoctoral research fellowships, supported first (1991) by the Alexander von Humboldt Foundation and later (1992) by a European Community Bursary. Both were held at the Lehrstuhl fur Angewandte Optik in Erlangen-Nürnberg University, under the leadership of Prof. Dr A. W. Lohmann. In 1994 he took up a position as a visiting scientist at the European Commission Joint Research Centre, in Italy. In 1997 he was appointed to the School of Physics, Dublin Institute of Technology as a permanent lecturer.
He joined the School of Electrical and Electronic Engineering, University College Dublin (UCD), in 2000 as a College Lecturer. In 2005 he became a Senior Lecturer, and in 2007 Prof. of Optical Engineering. He coordinates the Masters Degree in Optical Engineering. He has supervised >20 PhDs to completion in UCD.
He has authored >400 widely cited papers (ISI Web of Science: h~40 & Google Scholar: h~47).
He regularly serves on international conference, award and review committees and is a member of the editorial boards of several peer reviewed journals.
In 2006 he co-founded Generic Light, in 2013 Equilume Ltd. and in 2016 BRS-optics.
He is fellow of: SPIE (2014), OSA (2016), FIMA (2018).
John is married to the very wonderful Dr Jutta Baum-Sheridan and is the extremely proud father of M. Daniel O. Sheridan.
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Fast subpixel displacement measurement, part 1: one-dimensional analysis, simulation, and experiment
In our recent works we addressed the issue of spatially variant accuracy of the HT reconstructions, which results from the insufficient model of diffraction that is applied in the widely-used tomographic reconstruction algorithms basing on the Rytov approximation. In the present study, we continue investigating the spatially variant properties of the HT imaging, however, we are now focusing on the limited spatial size of holograms as a source of this problem. Using the Wigner distribution representation and the Ewald sphere approach, we show that the limited size of the holograms results in a decreased quality of tomographic imaging in off-center regions of the HT reconstructions. This is because the finite detector extent becomes a limiting aperture that prohibits acquisition of full information about diffracted fields coming from the out-of-focus structures of a sample. The incompleteness of the data results in an effective truncation of the tomographic transfer function for the out-of-center regions of the tomographic image. In this paper, the described effect is quantitatively characterized for three types of the tomographic systems: the configuration with 1) object rotation, 2) scanning of the illumination direction, 3) the hybrid HT solution combing both previous approaches.
Robustness of double random phase encoding spread-space spread-spectrum image watermarking technique
Holographic optical coupling and beamsplitting elements for optoelectronic interconnects and sensors
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