Prof. Román Castañeda Sepulveda Profile

Prof. Román Castañeda Sepulveda

Titular Professor for Physics at Univ Nacional de Colombia Sede Medellín

SPIE Involvement:

Author

Publications (29)

Proceedings Article | 28 June 2023 Open Access

Open Access

Poster + Paper

Outreach experiments guide for an optic show to pre-college level by Medellin student chapter

Pablo Bedoya-Ríos, Samuel Zapata-Valencia, Ana Muñoz R., Rafael Casalins-Hernández, Camilo Hurtado, Francisco Londoño-García, Thomas Serna-Restrepo, Rafael Duvan Ricardo-Romero, Andrea Hinestroza-Caicedo, Dayana Madrid-Alean, Edgar Yesid Renteria Rojas, Alejandra Zapata-Tamayo, Steven Nacir Olivares Araque, Carlos Rojas-Ibarra, Sara Ximena Bello-Gomez, Laura Becerra-Largo, Cristhian Alfredo Goyez-Rodríguez, Luis Felipe Holguín Villada, Jesús Bonilla, Juan Jose Zapata Moreno, Josselyn Fernandez Cifuentes, Román Castañeda

Proceedings Volume 12723, 127230M (2023) https://doi.org/10.1117/12.2666959

KEYWORDS: Color, Polarization, Light sources, Glasses, Diffraction, Mirrors, Reflection, Polarizers, Electrons, Diffraction gratings

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Proceedings Article | 18 November 2013 Paper

Paper

Effect of the internal modulation of speckles in displacement measurements in optical vortex metrology

Daniel Gomez-Tejada, Daniel Sierra-Sosa, Román Castañeda, Luciano Angel-Toro

Proceedings Volume 8785, 87858C (2013) https://doi.org/10.1117/12.2026469

KEYWORDS: Modulation, Speckle, Speckle pattern, Spiral phase plates, Optical vortices, Metrology, Quality measurement, Optical testing, Phase shift keying, Diffusers

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Proceedings Article | 3 November 2011 Paper

Paper

Classical modelling of the fourth-order spatial coherence state of scalar wave-fields

Román Castañeda, Gustavo Cañas-Cardona, Juan González-Toro, Herbert Vinck-Posada

Proceedings Volume 8011, 80116F (2011) https://doi.org/10.1117/12.903363

KEYWORDS: Spatial coherence, Sensors, Modulation, Virtual point source, Modeling, Wave propagation, Wavelets, Light, Diffraction, Physics

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Proceedings Article | 26 October 2011 Paper

Paper

Exact modeling of propagation of partially coherent optical fields

Roman Castañeda, Jorge García-Sucerquia

Proceedings Volume 8011, 80115S (2011) https://doi.org/10.1117/12.901203

KEYWORDS: Diffraction, Spatial coherence, Modulation, Spatial frequencies, Geometrical optics, Light, Virtual point source, Digital holography, Computer simulations, Far-field diffraction

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Proceedings Article | 11 August 2008 Paper

Paper

Interference: dark rays description

R. Betancur, R. Castañeda, J. Restrepo

Proceedings Volume 7064, 70640X (2008) https://doi.org/10.1117/12.797566

KEYWORDS: Spatial coherence, Modulation, Wavelets, Diffraction, Destructive interference, Polarization, Beam shaping, Geometrical optics, Superposition, Fringe analysis

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Proceedings Article | 11 August 2008 Paper

Paper

Spatial coherence wavelets and the phase-space representation of holography

R. Betancur, R. Castañeda, J. Restrepo

Proceedings Volume 7063, 70631C (2008) https://doi.org/10.1117/12.797567

KEYWORDS: Spatial coherence, Holography, Wavelets, Holograms, Phase shift keying, Diffraction, Wave propagation, 3D image reconstruction, Far-field diffraction, Coherence (optics)

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Proceedings Article | 11 August 2008 Paper

Paper

Novel keys for analyzing physical features of light

R. Betancur, R. Castaneda

Proceedings Volume 7057, 70570A (2008) https://doi.org/10.1117/12.794869

KEYWORDS: Spatial coherence, Wavelets, Diffraction, Radio propagation, Electromagnetism, Superposition, Wave propagation, Modulation, Beam shaping, Wave propagation interference

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Proceedings Article | 29 January 2007 Paper

Paper

Compression of color images using a hologram of gray tones

Alejandro Restrepo-Martínez, Roman Castañeda

Proceedings Volume 6493, 64931I (2007) https://doi.org/10.1117/12.703612

KEYWORDS: Holograms, Image compression, 3D image reconstruction, Digital holography, Image quality, RGB color model, Modulation, Optical filters, Bandpass filters, Image processing

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Proceedings Article | 14 August 2006 Paper

Paper

Transmission digital holography microscopy applied to the study of coal palynofacies

Alejandro Restrepo, Jorge Herrera, Román Castañeda, Christopher Mann, Myung Kim

Proceedings Volume 6292, 62920U (2006) https://doi.org/10.1117/12.680211

KEYWORDS: Digital holography, Particles, Microscopy, 3D modeling, Refractive index, Holograms, Microscopes, Optical microscopy, Convolution, Tissues

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Proceedings Article | 20 January 2006 Paper

Paper

Resolution, focus depth in the Fresnel-Fraunhofer domains

Francisco Medina, Roman Castaneda, Jorge Garcia-Sucerquia

Proceedings Volume 6027, 60272I (2006) https://doi.org/10.1117/12.668214

KEYWORDS: Near field diffraction, Spatial coherence, Imaging systems, Far-field diffraction, Diffraction, Spatial resolution, Physics, Point spread functions, Visibility, Image resolution

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SPIE Journal Paper | 1 May 2005 Open Access

Open Access

Centered reduced moments and associate density functions applied to alkaline comet assay

Román Castañeda, Alejandro Pelaez, Maria-Elena Marquez, Pablo Abad

JBO, Vol. 10, Issue 03, 034004, (May 2005) https://doi.org/10.1117/12.10.1117/1.1920567

KEYWORDS: Comets, Head, Image segmentation, CCD cameras, Physics, Glasses, Optical microscopes, Image analysis, Molecules, Biotechnology

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Proceedings Article | 21 October 2004 Paper

Paper

Full retrieving of the complex degree of spatial coherence through the spot moments

Roman Castaneda, Jorge Ivan Garcia-Sucerquia, J. Carrasquilla

Proceedings Volume 5622, (2004) https://doi.org/10.1117/12.591642

KEYWORDS: Spatial coherence, Fourier transforms, Helium neon lasers, Molybdenum, Collimators, CCD image sensors, Physics, Laser optics, Sensors, Optical filters

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Proceedings Article | 21 October 2004 Paper

Paper

Radiometry through spatial coherence wavelets

Roman Castaneda, Jorge Ivan Garcia-Sucerquia

Proceedings Volume 5622, (2004) https://doi.org/10.1117/12.590797

KEYWORDS: Spatial coherence, Radiometry, Wavelets, Wigner distribution functions, Radio optics, Laser optics, Physics, Dual energy x-ray absorptiometry, Laser applications, Stereolithography

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Proceedings Article | 21 October 2004 Paper

Paper

Reduction of speckle noise in digital holography

Jorge Ivan Garcia-Sucerquia, J. Herrera Ramirez, Roman Castaneda, Daniel Velasquez Prieto

Proceedings Volume 5622, (2004) https://doi.org/10.1117/12.591652

KEYWORDS: Digital holography, Speckle, Holograms, Digital filtering, Image processing, Image filtering, Holography, CCD cameras, Diffraction, Digital recording

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Proceedings Article | 26 August 2004 Paper

Paper

Dyadic-shift-based image processing

Roman Castaneda, Javier Gonzalez, Kenneth Cabrera

Proceedings Volume 5566, (2004) https://doi.org/10.1117/12.577157

KEYWORDS: Image processing, Digital imaging, Matrices, Image encryption, Image filtering, Binary data, Transform theory, Image restoration, Image enhancement, Pattern recognition

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Proceedings Article | 19 November 2003 Paper

Paper

Phase retrieval of gratings by applying Fourier analysis

Roman Castaneda, Jorge Ivan Garcia-Sucerquia, Francisco Medina-Estrada

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.524032

KEYWORDS: Phase retrieval, Physics, Fourier transforms, Spatial coherence, Superposition, Detection and tracking algorithms

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Proceedings Article | 19 November 2003 Paper

Paper

M2 invariance through the etendue for gaussian Schell model sources

Jorge Ivan Garcia-Sucerquia, Roman Castaneda, Francisco Medina-Estrada

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.523809

KEYWORDS: Global system for mobile communications, Process modeling, Spatial frequencies, Diffraction, Beam propagation method

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Proceedings Article | 19 November 2003 Paper

Paper

Spatial coherence beams in the far field

Roman Castaneda, Jorge Ivan Garcia-Sucerquia, Francisco Medina-Estrada

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.524004

KEYWORDS: Spatial coherence, Coherence (optics), Moire patterns, Beam propagation method, Superposition, Wave propagation, Physics

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Proceedings Article | 19 November 2003 Paper

Paper

Fresnel and Fraunhofer domains in diffraction of spatially partially coherent fields

Jorge Ivan Garcia-Sucerquia, Roman Castaneda, Francisco Medina-Estrada

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.524031

KEYWORDS: Diffraction, Spatial coherence, Far-field diffraction, Near field diffraction, Physics, Sensors, Bessel functions, Radon, Visibility

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Proceedings Article | 19 November 2003 Paper

Paper

Tubular structures of diffracted fields

Jorge Ivan Garcia-Sucerquia, Roman Castaneda, Francisco Medina-Estrada, Giorgio Matteucci

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.523674

KEYWORDS: Singular optics, Computer simulations, Geometrical optics, Physics, Optical tweezers, Particles, Diffraction, Sensors, Surface plasmons, Optical simulations

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Proceedings Article | 19 November 2003 Paper

Paper

Classes of source pairs and etendue renormalization in interference and diffraction

Roman Castaneda, Jorge Ivan Garcia-Sucerquia, Francisco Medina-Estrada

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.524875

KEYWORDS: Diffraction, Superposition, Physics, Spatial coherence

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Proceedings Article | 19 July 1999 Paper

Paper

Partially coherent effects in Young-Michelson's interferograms

Roman Castaneda, Francisco Medina-Estrada, Mario Garavaglia, Lia Zerbino

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.354883

KEYWORDS: Michelson interferometers, Modulation, Coherence (optics), Spatial coherence, Visibility, Physics, Mirrors, Lanthanum, Copper, Helium neon lasers

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Proceedings Article | 19 July 1999 Paper

Paper

Moire in interference with spatial coherence beams

Roman Castaneda, Francisco Medina-Estrada

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.354945

KEYWORDS: Spatial coherence, Moire patterns, Superposition, Physics, Analytical research, Transmittance, Diffraction gratings, Diffraction, Mathematical modeling, Coherence (optics)

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Proceedings Article | 6 July 1999 Paper

Paper

Spatial coherence beam fundamentals: the Wigner distribution and the triple correlation function

Roman Castaneda, Francisco Medina-Estrada

Proceedings Volume 3572, (1999) https://doi.org/10.1117/12.358414

KEYWORDS: Spatial coherence, Wigner distribution functions, Correlation function, Transmittance, Fourier transforms, Physics, Resonators, Spherical lenses, Mirrors, Optical metrology

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Proceedings Article | 6 July 1999 Paper

Paper

Partially spatial coherence beams: nonregular interference gratings and microscopy illumination

Roman Castaneda, Francisco Medina-Estrada

Proceedings Volume 3572, (1999) https://doi.org/10.1117/12.358401

KEYWORDS: Spatial coherence, Moire patterns, Microscopes, Microscopy, Transmittance, Physics, Control systems, Fiber optic illuminators, Mathematical modeling, Visibility

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SPIE Journal Paper | 1 October 1996

Analysis of a quasi-periodical structure through its autocorrelation function

Yobani Mejia, Vladimir Markov, Roman Castaneda

OE, Vol. 35, Issue 10, (October 1996) https://doi.org/10.1117/12.10.1117/1.600970

KEYWORDS: Diffraction gratings, Transmittance, Diffraction, Fourier transforms, Far-field diffraction, Optical engineering, Modulation, Visual optics, CCD cameras, Algorithm development

Proceedings Article | 15 March 1996 Paper

Paper

Correlation analysis of pseudo-identical structures for pattern recognition

Vladimir Markov, Yobani Mejia, Roman Castaneda

Proceedings Volume 2659, (1996) https://doi.org/10.1117/12.235458

KEYWORDS: Transmittance, Diffraction, Image analysis, Visual optics, Fourier transforms, Pattern recognition, Printing, Distance measurement, Spatial frequencies, Critical dimension metrology

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Proceedings Article | 5 February 1996 Paper

Paper

Numerical blur-up criterion in speckle patterns

Roman Castaneda, Francisco Medina-Estrada, B. Yepes

Proceedings Volume 2730, (1996) https://doi.org/10.1117/12.231086

KEYWORDS: Speckle pattern, Diffusers, Superposition, Speckle, Sensors, Photography, Optical components, Particles, Objectives, Motion analysis

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Proceedings Article | 5 February 1996 Paper

Paper

Imaging quality analysis in spatial frequency domain by using PSF moments

Roman Castaneda

Proceedings Volume 2730, (1996) https://doi.org/10.1117/12.231053

KEYWORDS: Point spread functions, Optical transfer functions, Matrices, Imaging systems, Optical imaging, Diffraction, Image quality, Image analysis, Ultraviolet radiation, Monochromatic aberrations

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Showing 5 of 29 publications

Conference Committee Involvement (1)

Systems of Optical Security

1 September 2005 | Warsaw, Poland

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