Dr. Colm P. Bracken Profile

Dr. Colm P. Bracken

at National Univ of Ireland, Maynooth

SPIE Involvement:

Author

Publications (14)

Proceedings Article | 29 August 2022 Presentation + Paper

Repurposing ROACH-1 boards for prototyping of readout systems for optical-NIR MKIDs

Oisín Creaner, Colm Bracken, Jack Piercy, Gerhard Ulbricht, Eoin Baldwin, Mario De Lucia, Tom Ray

Proceedings Volume 12191, 1219112 (2022) https://doi.org/10.1117/12.2626985

KEYWORDS: Prototyping, Software development, Binary data, Inductance, Temporal resolution, Sensors, Resonators, Photodetectors, Multiplexing, Astronomical detectors, Astronomical instrumentation, Astronomical software, Spectral resolution, Spatial resolution

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Proceedings Article | 29 August 2022 Presentation + Paper

High-uniformity TiN/Ti/TiN multilayers for the development of Microwave Kinetic Inductance Detectors

Mario De Lucia, E. Baldwin, G. Ulbricht, J. Piercy, O. Creaner, C. Bracken, T. Ray

Proceedings Volume 12191, 1219105 (2022) https://doi.org/10.1117/12.2626867

KEYWORDS: Superconductors, Resonators, Inductance, Resistance, Titanium, Sensors, Multilayers, Temperature metrology

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Proceedings Article | 29 August 2022 Presentation

Performance of photon counting, optical to near-IR Microwave Kinetic Inductance Detectors utilizing proximity effects in Ti / TiN multilayers

Gerhard Ulbricht, Mario De Lucia, Eoin Baldwin, Jack Piercy, Oisin Creaner, Colm Bracken, Tom Ray

Proceedings Volume 12191, 1219106 (2022) https://doi.org/10.1117/12.2626869

KEYWORDS: Multilayers, Tin, Sensors, Photon counting, Microwave radiation, Inductance, Superconductors, Image resolution, Technetium, Single photon

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Proceedings Article | 13 December 2020 Poster

Frequency domain multiplexing with the Xilinx ZCU111 RFSoC board

Eoin Baldwin, Mario De Lucia, Colm Bracken, Gerhard Ulbricht, Tom Ray

Proceedings Volume 11454, 114542Q (2020) https://doi.org/10.1117/12.2561108

KEYWORDS: Multiplexing, Field programmable gate arrays, Digital filtering, Microwave radiation, Inductance, Sensors, Data conversion, Resonators, Astronomy, Signal processing

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Proceedings Article | 13 December 2020 Poster + Paper

Multiplexable frequency retuning of MKID arrays using their non-linear kinetic inductance

M. De Lucia, E. Baldwin, G. Ulbricht, C. Bracken, P. Stamenov, T. Ray

Proceedings Volume 11454, 114542Z (2020) https://doi.org/10.1117/12.2560384

KEYWORDS: Inductance, Resonators, Microwave radiation, Sensors, Detector arrays, Lithography

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SPIE Journal Paper | 9 February 2018

Multimode simulations of a wide field of view double-Fourier far-infrared spatio–spectral interferometer

Colm Bracken, John Lightfoot, Creidhe O'Sullivan, J. Anthony Murphy, Anthony Donohoe, Giorgio Savini, Roser Juanola-Parramon, on behalf of FISICA Consortium

JATIS, Vol. 4, Issue 01, 018004, (February 2018) https://doi.org/10.1117/12.10.1117/1.JATIS.4.1.018004

KEYWORDS: Sensors, Interferometers, Mirrors, Optical simulations, Device simulation, Telescopes, Interferometry, Waveguides, Computer simulations, Wave propagation

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Proceedings Article | 24 February 2017 Paper

Radiation patterns of multimode feed-horn-coupled bolometers for FAR-IR space applications

Eimante Kalinauskaite, J. Anthony Murphy, Ian McAuley, Neal Trappe, Darragh McCarthy, Colm Bracken, Stephen Doherty, Marcin Gradziel, Créidhe O'Sullivan, Daniel Wilson, Tully Peacocke, Bruno Maffei, Jean-Michel Lamarre, Peter A. Ade, Giorgio Savini

Proceedings Volume 10103, 101030N (2017) https://doi.org/10.1117/12.2249869

KEYWORDS: Bolometers, Sensors, Waveguides, Extremely high frequency, Terahertz radiation, Beam controllers, Black bodies, Thin films, Computer simulations, Waveguide modes, Electronic filtering, Scattering, Matrices, Optical simulations, Thermal modeling, Free space

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Proceedings Article | 19 July 2016 Paper

Modeling multimode feed-horn coupled bolometers for millimeter-wave and terahertz astronomical instrumentation

Eimante Kalinauskaite, Anthony Murphy, Ian McAuley, Neil Trappe, Colm Bracken, Darragh McCarthy, Stephen Doherty, Marcin Gradziel, Creidhe O'Sullivan, Bruno Maffei, Jean-Michel Lamarre, Peter A. Ade, Giorgio Savini

Proceedings Volume 9914, 99142R (2016) https://doi.org/10.1117/12.2231444

KEYWORDS: Sensors, Bolometers, Waveguides, Scattering, Antennas, Matrices, Waveguide modes, Systems modeling, Resistance, Absorption

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Proceedings Article | 25 February 2016 Paper

Electromagnetic modelling of a space-borne far-infrared interferometer

Anthony Donohoe, Créidhe O'Sullivan, J. Anthony Murphy, Colm Bracken, Giorgio Savini, Enzo Pascale, Peter Ade, Rashmi Sudiwala, Amber Hornsby

Proceedings Volume 9747, 97471H (2016) https://doi.org/10.1117/12.2214446

KEYWORDS: Interferometers, Electromagnetism, Modeling, Astronomy, Terahertz radiation, Far infrared, Interferometry, Telescopes, Mirrors, Diffraction, Spherical lenses, Beam splitters, Collimators, Visibility

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Proceedings Article | 14 March 2015 Paper

Optical and quasi-optical analysis of system components for a far-infrared space interferometer

C. Bracken, C. O'Sullivan, A. Donohoe, A. Murphy, G. Savini, R. Juanola-Parramon, Nicola Baccichet, A. Guisseau, P. Ade, E. Pascale, L. Spencer, I. Walker, K. Dohlen, John Lightfoot, W. Holland, Martyn Jones, D. Walker, Alison McMillan

Proceedings Volume 9362, 93620N (2015) https://doi.org/10.1117/12.2076385

KEYWORDS: Mirrors, Telescopes, Space telescopes, Interferometers, Visibility, Beam propagation method, Wavefronts, Interferometry, Monochromatic aberrations, Spatial resolution

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Proceedings Article | 23 July 2014 Paper

Efficient algorithms for optimising the optical performance of profiled smooth walled horns for future CMB and Far-IR missions

Darragh McCarthy, Neil Trappe, J. Anthony Murphy, Créidhe O'Sullivan, Marcin Gradziel, Stephen Doherty, Colm Bracken, Niall Tynan, Arturo Polegre, Peter Huggard

Proceedings Volume 9153, 915316 (2014) https://doi.org/10.1117/12.2056336

KEYWORDS: Phase measurement, Waveguides, Antennas, Scattering, Polarization, Sensors, Microwave radiation, Manufacturing, Bolometers, Throat

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Astronomical observations in the far-infrared are critical for investigation of cosmic microwave background (CMB) radiation and the formation and evolution of planets, stars and galaxies. In the case of space telescope receivers, a strong heritage exists for corrugated horn antenna feeds to couple the far-infrared signals to the detectors mounted in a waveguide or cavity structure. Such antenna feeds have been utilized, for example, in the Planck satellite in both single-mode channels for the observation of the CMB and the multi-mode channels optimized for the detection of foreground sources. Looking to the demands of the future space missions, it is clear that the development of new technology solutions for the optimization and simplification of horn antenna structures will be required for large arrays. Horn antennas will continue to offer excellent control of beam and polarization properties for CMB polarisation experiments satisfying stringent requirements on low sidelobe levels, symmetry, and low cross polarization in large arrays. Similarly for far infrared systems, multi-mode horn and waveguide cavity structures are proposed to enhance optical coupling of weak signals for cavity coupled bolometers. In this paper we present a computationally efficient approach for modelling and optimising horn character-istics. We investigate smooth-walled horns that have an equivalent optical performance to that of corrugated horns traditionally used for CMB measurements. We discuss the horn optimisation process and the algorithms available to maximise performance of a merit parameter such as low cross polarisation or high Gaussicity. A single moded horn resulting from this design process has been constructed and experimentally verified in the W band. The results of the measurement campaign are presented in this paper and compared to the simulated results, showing a high level of agreement in co and cross polarisation radiation patterns, with low levels of integrated cross polar power. For future Far IR receivers using waveguide bounded bolometers and absorbers, an optimisation of the waveg-uide structures and absorber location within the integrating cavity is critical to maximise coupling performance particularly for multimoded systems. We outline the benefit of using multi-moded horns in focal plane arrays and illustrate the increased optical sensitivity associated with a many-moded approach, which may be optimized for coupling to particular incident beams.

Proceedings Article | 27 March 2013 Paper

Efficient horn antennas for next-generation terahertz and millimeter-wave space telescopes

Darragh McCarthy, Neil Trappe, Anthony Murphy, Colm Bracken, Stephen Doherty, Marcin Gradziel, Créidhe O'Sullivan

Proceedings Volume 8624, 862413 (2013) https://doi.org/10.1117/12.2001268

KEYWORDS: Scattering, Matrices, Waveguides, Antennas, Polarization, Space telescopes, Genetic algorithms, Wave propagation, Microwave radiation, Signal detection

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Proceedings Article | 24 September 2012 Paper

Optical modeling of waveguide coupled TES detectors towards the SAFARI instrument for SPICA

N. Trappe, C. Bracken, S. Doherty, J. Gao, D. Glowacka, D. Goldie, D. Griffin, R. Hijmering, B. Jackson, P. Khosropanah, P. Mauskopf, D. Morozov, A. Murphy, C. O'Sullivan, M. Ridder, S. Withington

Proceedings Volume 8452, 84520L (2012) https://doi.org/10.1117/12.926760

KEYWORDS: Sensors, Waveguides, Waveguide modes, Wave propagation, Antennas, Free space, Scattering, Prototyping, Silicon, Instrument modeling

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