Prof. Paulo J. V. Garcia Profile

Prof. Paulo J. V. Garcia

at Univ do Porto

SPIE Involvement:

Author

Publications (25)

Proceedings Article | 12 July 2018 Presentation + Paper

Status of the mid-IR ELT imager and spectrograph (METIS)

Bernhard Brandl, Olivier Absil, Tibor Agócs, Nicola Baccichet, Thomas Bertram, Felix Bettonvil, Roy van Boekel, Leonard Burtscher, Ewine van Dishoeck, Markus Feldt, Paulo J. Garcia, Alistair Glasse, Adrian Glauser, Manuel Güdel, Christoph Haupt, Matthew Kenworthy, Lucas Labadie, Werner Laun, Dirk Lesman, Eric Pantin, Sascha Quanz, Ignas Snellen, Ralf Siebenmorgen, Hans van Winckel

Proc. SPIE. 10702, Ground-based and Airborne Instrumentation for Astronomy VII

KEYWORDS: Telescopes, Mirrors, Spectrographs, Imaging systems, Calibration, Spectroscopy, Imaging spectroscopy, Adaptive optics, Coronagraphy, Planets

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Proceedings Article | 6 July 2018 Paper

Development of an alignment platform for ESO's mid-infrared E-ELT imager and spectrograph (METIS)

André Boné, António Amorim, Paulo Gordo, Izabella Hemprich, Gabby Kroes, Adrian Glauser, Stephen March, Gert Raskin, Paulo Garcia

Proc. SPIE. 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave

KEYWORDS: Actuators, Mid-IR, Telescopes, Spectrographs, Imaging systems, Kinematics, 3D modeling, Earthquakes

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Proceedings Article | 4 August 2016 Paper

GRAVITY acquisition camera: characterization results

Narsireddy Anugu, Paulo Garcia, Antonio Amorim, Erich Wiezorrek, Ekkehard Wieprecht, Frank Eisenhauer, Thomas Ott, Oliver Pfuhl, Paulo Gordo, Guy Perrin, Wolfgang Brandner, Christian Straubmeier, Karine Perraut

Proc. SPIE. 9907, Optical and Infrared Interferometry and Imaging V

KEYWORDS: Actuators, Telescopes, Mirrors, Stars, Imaging systems, Cameras, Sensors, Image sensors, Optical tracking, Electroluminescent displays

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Proceedings Article | 4 August 2016 Paper

User-friendly imaging algorithms for interferometry

John Young, Éric Thiébaut, Gilles Duvert, Martin Vannier, Paulo Garcia, Guillaume Mella

Proc. SPIE. 9907, Optical and Infrared Interferometry and Imaging V

KEYWORDS: Human-machine interfaces, Detection and tracking algorithms, Data modeling, Image processing, Image restoration, Interferometry, Optical interferometry, Reconstruction algorithms, Algorithm development, Prototyping

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Proceedings Article | 24 July 2014 Paper

Two, three, four, or six telescopes with phase referencing or closure phase relations: the best tactics for interferometric image reconstruction

Nuno Gomes, Paulo J. V. Garcia, Éric Thiébaut

Proc. SPIE. 9146, Optical and Infrared Interferometry IV

KEYWORDS: Point spread functions, Telescopes, Stars, Spatial frequencies, Ultraviolet radiation, Image restoration, Interferometry, Reconstruction algorithms, Ultraviolet telescopes, Visibility

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Proceedings Article | 24 July 2014 Paper

Optimal a posteriori fringe tracking in optical interferometry

Ferréol Soulez, Éric Thiebaut, Michel Tallon, Isabelle Tallon-Bosc, Paulo Garcia

Proc. SPIE. 9146, Optical and Infrared Interferometry IV

KEYWORDS: Signal to noise ratio, Data modeling, Sensors, Photons, Interferometry, Colorimetry, Turbulence, Optical tracking, Optical interferometry, Visibility

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Proceedings Article | 24 July 2014 Paper

Integration and testing of the GRAVITY infrared camera for multiple telescope optical beam analysis

Paulo Gordo, Antonio Amorim, Jorge Abreu, Frank Eisenhauer, Narsireddy Anugu, Paulo Garcia, Oliver Pfuhl, Marcus Haug, Eckhard Sturm, Ekkehard Wieprecht, Guy Perrin, Wolfgang Brandner, Christian Straubmeier, Karine Perraut, M. Duarte Naia, M. Guimarães

Proc. SPIE. 9146, Optical and Infrared Interferometry IV

KEYWORDS: Telescopes, Mirrors, Beam splitters, Silica, Imaging systems, Cameras, Sensors, Optical alignment, Optics manufacturing, Beam analyzers

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Proceedings Article | 24 July 2014 Paper

The GRAVITY/VLTI acquisition camera software

Narsireddy Anugu, Paulo J. Garcia, Ekkehard Wieprecht, Antonio Amorim, Leonard Burtscher, Thomas Ott, Paulo Gordo, Frank Eisenhauer, Guy Perrin, Wolfgang Brandner, Christian Straubmeier, Karine Perraut

Proc. SPIE. 9146, Optical and Infrared Interferometry IV

KEYWORDS: Telescopes, Stars, Imaging systems, Cameras, Sensors, Databases, Wavefronts, Refraction, Image sensors, Device simulation

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Proceedings Article | 21 July 2014 Paper

Near-infrared aberration tracking using a correlation algorithm on the Galactic Center

Narsireddy Anugu, Paulo Garcia, Antonio Amorim, Paulo Gordo, Frank Eisenhauer, Guy Perrin, Wolfgang Brandner, Christian Straubmeier, Karine Perraut

Proc. SPIE. 9148, Adaptive Optics Systems IV

KEYWORDS: Telescopes, Detection and tracking algorithms, Sensors, Wavefront sensors, Wavefronts, Wavefront aberrations, Adaptive optics, Image sensors, Reconstruction algorithms, Electroluminescent displays

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Proceedings Article | 12 September 2012 Paper

Least-squares deconvolution of AMBER dispersed visibilities

Paulo J. Garcia, Myriam Benisty, Catherine Dougados

Proc. SPIE. 8445, Optical and Infrared Interferometry III

KEYWORDS: Signal to noise ratio, Telescopes, Spectrographs, Data modeling, Calibration, Interferometry, Deconvolution, Spectral resolution, Analog electronics, Visibility

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Proceedings Article | 12 September 2012 Paper

The final design of the GRAVITY acquisition camera and associated VLTI beam monitoring strategy

Antonio Amorim, Jorge Lima, Narsireddy Anugu, Frank Eisenhauer, Alexander Graeter, Marcus Haug, Thomas Ott, Oliver Pfuhl, Markus Thiel, Ekkehard Wieprecht, Pedro Carvas, Paulo Garcia, Guy Perrin, Wolfgang Brandner, Christian Straubmeier, Karine Perraut

Proc. SPIE. 8445, Optical and Infrared Interferometry III

KEYWORDS: Telescopes, Mirrors, Metrology, Imaging systems, Lenses, Cameras, Sensors, Semiconductor lasers, Image sensors, Beam analyzers

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Proceedings Article | 26 July 2011 Paper

Integrated optics for astronomical interferometry

P. V. S. Marques, A. Ghasempour, D. Alexandre, A. M. P. Leite, P. J. V. Garcia, F. Reynaud

Proc. SPIE. 8001, International Conference on Applications of Optics and Photonics

KEYWORDS: Optical fibers, Waveguides, Ultraviolet radiation, Interferometry, Integrated optics, Sol-gels, Photometry, Rapid manufacturing, Visibility, Astronomical interferometry

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Proceedings Article | 22 July 2010 Paper

Defining requirements and identifying relevant technologies in astrophotonics

Jeremy Allington-Smith, Timothy Birks, Joss Bland-Hawthorn, Colin Cunningham, Sonali Dagupta, Roger Haynes, Paulo J. Garcia, Ajoy Kar, Andreas Kelz, Pierre Kern, Lucas Labadie, Jon Lawrence, Etienne Le Coarer, Martin Roth, Stefano Minardi, Ray Sharples, Robert Thomson

Proc. SPIE. 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation

KEYWORDS: Photonic devices, Telescopes, Spectrographs, Astronomy, Waveguides, Sensors, Spectroscopy, Interferometry, Integrated optics, Astrophotonics

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Proceedings Article | 22 July 2010 Paper

The hydrogen emission of young stellar objects: key science for next-generation instruments and facilities

Paulo J. Garcia, Myriam Benisty, Samira Rajabi, Catherine Dougados, Fabrizzio Massi, Francesca Bacciotti, Jean-Baptiste Le Bouquin, Fabien Malbet, Linda Podio, Stephanie Renard, Emma Whelan

Proc. SPIE. 7734, Optical and Infrared Interferometry II

KEYWORDS: Stars, Interferometers, Spectroscopy, Hydrogen, Magnetism, Interferometry, Infrared radiation, Neodymium, Visibility, Long baseline optical interferometry

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Proceedings Article | 22 July 2010 Paper

Hybrid sol-gel technology for fast prototyping in astronomical interferometry

A. Ghasempour, A. M. P. Leite, D. Alexandre, F. Reynaud, P. V. S. Marques, P. J. Garcia

Proc. SPIE. 7734, Optical and Infrared Interferometry II

KEYWORDS: Fabrication, Telescopes, Astronomy, Dispersion, Interferometry, Integrated optics, Sol-gels, Computer aided design, Prototyping, Visibility

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Proceedings Article | 22 July 2010 Paper

Comparison between closure phase and phase referenced interferometric image reconstructions

Nuno Gomes, Paulo J. Garcia, Eric Thiébaut, Stéphanie Renard, Mercedes Filho

Proc. SPIE. 7734, Optical and Infrared Interferometry II

KEYWORDS: Signal to noise ratio, Stars, Data modeling, Image restoration, Interferometry, Phase interferometry, Image quality, Reconstruction algorithms, Photometry, Visibility

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Proceedings Article | 28 July 2008 Paper

Rapid prototyping of integrated sol-gel devices for astronomical interferometry

A. Ghasempour, D. Alexandre, C. Brites, P. Moreira, F. Reynaud, P. Marques, A. Leite, P. Garcia

Proc. SPIE. 7013, Optical and Infrared Interferometry

KEYWORDS: Optical fibers, Astronomy, Waveguides, Ultraviolet radiation, Semiconductor lasers, Integrated optics, Sol-gels, Computer aided design, Rapid manufacturing, Astronomical interferometry

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Proceedings Article | 28 July 2008 Paper

System overview of the VLTI Spectro-Imager

L. Jocou, J. P. Berger, F. Malbet, P. Kern, U. Beckmann, D. Lorenzetti, L. Corcione, G. Li Causi, D. Buscher, J. Young, M. Gai, G. Weigelt, G. Zins, G. Duvert, K. Perraut, P. Labeye, O. Absil, P. Garcia, D. Loreggia, J. Lima, J. Rebordao, S. Ligori, A. Amorim, P. Rabou, J. B. Le Bouquin, C. Haniff, E. Le Coarer, P. Feautrier, G. Duchene, M. Benisty, A. Chelli, E. Herwats, A. Delboulbé

Proc. SPIE. 7013, Optical and Infrared Interferometry

KEYWORDS: Optical fibers, Mirrors, Spectrographs, Beam splitters, Sensors, Calibration, Fourier transforms, Interferometry, Computed tomography, Information operations

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Proceedings Article | 28 July 2008 Paper

Phase referencing in optical interferometry

Mercedes Filho, Paulo Garcia, Gilles Duvert, Gaspard Duchene, Eric Thiebaut, John Young, Olivier Absil, Jean-Phillipe Berger, Thomas Beckert, Sebastian Hoenig, Dieter Schertl, Gerd Weigelt, Leonardo Testi, Eric Tatuli, Virginie Borkowski, Michaël de Becker, Jean Surdej, Bernard Aringer, Joseph Hron, Thomas Lebzelter, Andrea Chiavassa, Romano Corradi, Tim Harries

Proc. SPIE. 7013, Optical and Infrared Interferometry

KEYWORDS: Signal to noise ratio, Telescopes, Stars, Radio optics, Image restoration, Fourier transforms, Image resolution, Interferometry, Optical interferometry, Visibility

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Proceedings Article | 28 July 2008 Paper

Science case for 1 mas spectro-imagining in the near-infrared

Paulo Garcia, Jean-Philippe Berger, Alessandro Marconi, Alexander Krivov, Andrea Chiavassa, Bernard Aringer, Brunella Nisini, Denis Defrére, Dimitri Mawet, Dieter Schertl, Eric Tatuli, Eric Thiébaut, Fabien Baron, Fabien Malbet, Gaspard Duchéne, Gerd Weigelt, Gilles Duvert, Gilles Henri, Hubert Klahr, Jean Surdej, Jean-Charles Augereau, Jean-François Claeskens, John Young, Josef Hron, Karine Perraut, Karl-Heinz Hofmann, Leonardo Testi, Margarida Cunha, Mercedes Filho, Michaël De Becker, Olivier Absil, Olivier Chesneau, Pierre Collette, Pierre-Olivier Petrucci, Ralph Neuhaeuser, Romano Corradi, Sónia Antón, Sebastian Wolf, Sebastian Hoenig, Stephanie Renard, Thierry Forveille, Thomas Beckert, Thomas Lebzelter, Tim Harries, Virginie Borkowski, Xavier Bonfils

Proc. SPIE. 7013, Optical and Infrared Interferometry

KEYWORDS: Telescopes, Stars, Interferometry, Adaptive optics, Spectral resolution, High dynamic range imaging, Spatial resolution, Planets, Galactic astronomy, Visibility

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We present the work developed within the science team of the Very Large Telescope Interferometer Spectro-Imager (VSI) during the Phase A studies. VSI aims at delivering ~ 1 milliarcsecond resolution data cubes in the near-infrared, with several spectral resolutions up to 12 000, by combining up to 8 VLTI telescopes. In the design of an instrument, the science case plays a central role by supporting the instrument construction decision, defining the top-level requirements and balancing design options. The overall science philosophy of VSI was that of a general user instrument serving a broad community. The science team addressed themes which included several areas of astrophysics and illustrated specific modes of operation of the instrument: a) YSO disks and winds; b) Multiplicity of young stars; c) Exoplanets; d) Debris disks; e) Stellar surface imaging; f) The environments of evolved stars; g) AGN tori; h) AGN's Broad Line Region; i) Supermassive black-holes; and j) Microlensing. The main conclusions can be summarized as follows: a) The accessible targets and related science are extremely sensitive to the instrument limiting magnitude; the instrument should be optimized for sensitivity and have its own fringe tracker. b) Most of the science cases are readily achievable with on-axis fringe tracking, off-axis fringe tracking enabling extra science. c) In most targets (YSOs, evolved stars and AGNs), the interpretation and analysis of circumstellar/nuclear dust morphology requires direct access to the gas via spectral resolved studies of emission lines, requiring at least a spectral resolution of 2 500. d) To routinely deliver images at the required sensitivity, the number of telescopes in determinant, with 6 telescopes being favored. e) The factorial increase in the number of closure phases and visibilities, gained in a single observation, makes massive surveys of parameters and related science for the first time possible. f) High dynamic range imaging and very high dynamic range differential closure phase are possible allowing the study of debris disks and characterization of pegasides. g) Spectro-imaging in the near-infrared is highly complementary to ALMA, adaptive optics and interferometric imaging in the thermal infrared.

Proceedings Article | 28 July 2008 Paper

Phase closure image reconstruction for future VLTI instrumentation

Mercedes Filho, Stephanie Renard, Paulo Garcia, Gilles Duvert, Eric Thiebaut, John Young, Olivier Absil, Jean-Phillipe Berger, Thomas Beckert, Sebastian Hoenig, Dieter Schertl, Gerd Weigelt, Leonardo Testi, Eric Tatuli, Virginie Borkowski, Michaël de Becker, Jean Surdej, Bernard Aringer, Joseph Hron, Thomas Lebzelter, Andrea Chiavassa, Romano Corradi, Tim Harries

Proc. SPIE. 7013, Optical and Infrared Interferometry

KEYWORDS: Telescopes, Stars, Data modeling, Interferometers, Image restoration, Fourier transforms, Interferometry, Optical interferometry, Astatine, Visibility

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Proceedings Article | 28 July 2008 Paper

VSI: the VLTI spectro-imager

F. Malbet, D. Buscher, G. Weigelt, P. Garcia, M. Gai, D. Lorenzetti, J. Surdej, J. Hron, R. Neuhäuser, P. Kern, L. Jocou, J.-P. Berger, O. Absil, U. Beckmann, L. Corcione, G. Duvert, M. Filho, P. Labeye, E. Le Coarer, G. Li Causi, J. Lima, K. Perraut, E. Tatulli, E. Thiébaut, J. Young, G. Zins, A. Amorim, B. Aringer, T. Beckert, M. Benisty, X. Bonfils, A. Cabral, A. Chelli, O. Chesneau, A. Chiavassa, R. Corradi, M. De Becker, A. Delboulbé, G. Duchêne, T. Forveille, C. Haniff, E. Herwats, K.-H. Hofmann, J.-B. Le Bouquin, S. Ligori, D. Loreggia, A. Marconi, A. Moitinho, B. Nisini, P.-O. Petrucci, J. Rebordao, R. Speziali, L. Testi, F. Vitali

Proc. SPIE. 7013, Optical and Infrared Interferometry

KEYWORDS: Signal to noise ratio, Telescopes, Stars, Image restoration, Interferometry, Space telescopes, Spectral resolution, Integrated optics, Spatial resolution, Visibility

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The VLTI Spectro Imager (VSI) was proposed as a second-generation instrument of the Very Large Telescope Interferometer providing the ESO community with spectrally-resolved, near-infrared images at angular resolutions down to 1.1 milliarcsecond and spectral resolutions up to R = 12000. Targets as faint as K = 13 will be imaged without requiring a brighter nearby reference object; fainter targets can be accessed if a suitable reference is available. The unique combination of high-dynamic-range imaging at high angular resolution and high spectral resolution enables a scientific program which serves a broad user community and at the same time provides the opportunity for breakthroughs in many areas of astrophysics. The high level specifications of the instrument are derived from a detailed science case based on the capability to obtain, for the first time, milliarcsecond-resolution images of a wide range of targets including: probing the initial conditions for planet formation in the AU-scale environments of young stars; imaging convective cells and other phenomena on the surfaces of stars; mapping the chemical and physical environments of evolved stars, stellar remnants, and stellar winds; and disentangling the central regions of active galactic nuclei and supermassive black holes. VSI will provide these new capabilities using technologies which have been extensively tested in the past and VSI requires little in terms of new infrastructure on the VLTI. At the same time, VSI will be able to make maximum use of new infrastructure as it becomes available; for example, by combining 4, 6 and eventually 8 telescopes, enabling rapid imaging through the measurement of up to 28 visibilities in every wavelength channel within a few minutes. The current studies are focused on a 4-telescope version with an upgrade to a 6-telescope one. The instrument contains its own fringe tracker and tip-tilt control in order to reduce the constraints on the VLTI infrastructure and maximize the scientific return.

Proceedings Article | 27 June 2006 Paper

VSI: a milli-arcsec spectro-imager for the VLTI

F. Malbet, P. Kern, J.-P. Berger, L. Jocou, P. Garcia, D. Buscher, K. Rousselet-Perraut, G. Weigelt, M. Gai, J. Surdej, J. Hron, R. Neuhäuser, E. Le Coarer, P. Labeye, J. Le Bouquin, M. Benisty, E. Herwats

Proc. SPIE. 6268, Advances in Stellar Interferometry

KEYWORDS: Telescopes, Spectrographs, Stars, Sensors, Imaging spectroscopy, Adaptive optics, Spectral resolution, Integrated optics, Phase measurement, Information operations

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Proceedings Article | 20 October 2004 Paper

VITRUV, a second-generation VLTI instrument for aperture synthesis imaging with eight telescopes

Fabien Malbet, Jean-Philippe Berger, Pierre Kern, Karine Rousselet-Perraut, Pierre-Olivier Petrucci, Francois Menard, Alain Chelli, Gilles Duvert, Jean-Baptiste Lebouquin, Eric Tatulli, Pierre Labeye, Isabelle Schanen-Duport, Eric Thiebaut, Paulo Garcia, I. Carvalho

Proc. SPIE. 5491, New Frontiers in Stellar Interferometry

KEYWORDS: Telescopes, Stars, Radio optics, Interferometers, Magnetism, Interferometry, Synthetic apertures, Objectives, Integrated optics, Spatial resolution

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Proceedings Article | 20 October 2004 Paper

Observing jets in young stellar objects with AMBER/VLTI

Carla Gil, Eric Thiebaut, Paulo Garcia, Markus Schoeller

Proc. SPIE. 5491, New Frontiers in Stellar Interferometry

KEYWORDS: Signal to noise ratio, Stars, Image restoration, Magnetism, Interferometry, Collimation, Spectral resolution, Spatial resolution, Phase measurement, Visibility

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