Dr. German Cortes-Medellin Profile

Dr. German Cortes-Medellin

Visiting Scientist

SPIE Involvement:

Author

Area of Expertise:

Electromagnetic Optics , Radiotelescope Design , Antenna feeds , Reflector Optics , THz Anti Reflective coating on Silicon

Publications (14)

Proceedings Article | 26 August 2022 Presentation

ALPACA: a fully cryogenic L-band phased array feed for radio astronomy

Amit Vishwas, Stephen Parshley, George Gull, German Cortes-Medellin, Kayla Rossi, Terry Herter, Donald Campbell, Mitchell Burnett, Spencer Ammermon, Nathaniel Ashcraft, Erich Nygaard, Karl Warnick, Brian Jeffs, Hamdi Mani, Christopher Groppi, Phil Perillat

Proceedings Volume PC12190, PC121900G (2022) https://doi.org/10.1117/12.2629422

KEYWORDS: Phased arrays, L band, Cryogenics, Radio astronomy, Pulsars, Data conversion, Zoom lenses, Telescopes, Spectroscopy, Radio telescopes

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Proceedings Article | 10 July 2018 Paper

Optimizing the efficiency of Fabry-Perot interferometers with silicon-substrate mirrors

Nicholas Cothard, Mahiro Abe, Thomas Nikola, Gordon Stacey, German Cortes-Medellin, Patricio Gallardo, Brian Koopman, Michael Niemack, Stephen Parshley, Eve Vavagiakis, Kenny Vetter

Proceedings Volume 10706, 107065B (2018) https://doi.org/10.1117/12.2313483

KEYWORDS: Silicon, Metals, Mirrors, Etching, Metamaterials, Gold, Reflectivity, Semiconducting wafers, Transmittance, Deep reactive ion etching

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Proceedings Article | 9 August 2016 Paper

Concept design of an 80-dual polarization element cryogenic phased array camera for the Arecibo Radio Telescope

German Cortes-Medellin, Stephen Parshley, Donald Campbell, Karl Warnick, Brian Jeffs, Rajagopalan Ganesh

Proceedings Volume 9908, 99085F (2016) https://doi.org/10.1117/12.2233899

KEYWORDS: Cameras, Cryogenics, Phased arrays, Optical instrument design, Polarization, Radio telescopes, L band, Antennas, Foam, Spectroscopy

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Proceedings Article | 27 July 2016 Paper

Optical design of the 25m CCAT sub-mm wave telescope

German Cortes-Medellin, Stephen Parshley

Proceedings Volume 9906, 99063G (2016) https://doi.org/10.1117/12.2233896

KEYWORDS: Optical design, Telescopes, Optical design, Optical instrument design, Space telescopes, Mirrors, Molybdenum, Optics manufacturing, Dielectrophoresis, Astrophysics, Planetary science

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Proceedings Article | 27 July 2016 Paper

Optical design for the large balloon reflector

German Cortes-Medellin, Stefan O'Dougherty, Christopher Walker, Paul Goldsmith, Chris Groppi, Steve Smith, Pietro Bernasconi

Proceedings Volume 9906, 99061Y (2016) https://doi.org/10.1117/12.2233861

KEYWORDS: Space telescopes, Telescopes, Reflectors, Optical design, Terahertz radiation, Spherical lenses, Tolerancing, Clouds, Astronomy, Solar system

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Proceedings Article | 19 August 2014 Paper

SWCam: the short wavelength camera for the CCAT Observatory

Gordon Stacey, Stephen Parshley, Thomas Nikola, German Cortes-Medellin, Justin Schoenwald, Ganesh Rajagopalan, Michael Niemack, Tim Jenness, Patricio Gallardo, Brian Koopman, Charles Dowell, Peter Day, Matthew Hollister, Attila Kovacs, Henry LeDuc, Christopher McKenney, Ryan Monroe, Hiroshige Yoshida, Jonas Zmuidzinas, Loren Swenson, Simon Radford, Hien Trong Nguyen, Anthony Mroczkowski, Jason Glenn, Jordan Wheeler, Philip Maloney, Spencer Brugger, Joseph Adams, Frank Bertoldi, Reinhold Schaaf, Mark Halpern, Douglas Scott, Galen Marsden, Jack Sayers, Scott Chapman, Joaquin Vieira

Proceedings Volume 9153, 91530L (2014) https://doi.org/10.1117/12.2057101

KEYWORDS: Cameras, Galactic astronomy, Sensors, Silicon, Stars, Thin film coatings, Telescopes, Deep reactive ion etching, Surface conduction electron emitter displays, Observatories

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We describe the Short Wavelength Camera (SWCam) for the CCAT observatory including the primary science drivers, the coupling of the science drivers to the instrument requirements, the resulting implementation of the design, and its performance expectations at first light. CCAT is a 25 m submillimeter telescope planned to operate at 5600 meters, near the summit of Cerro Chajnantor in the Atacama Desert in northern Chile. CCAT is designed to give a total wave front error of 12.5 μm rms, so that combined with its high and exceptionally dry site, the facility will provide unsurpassed point source sensitivity deep into the short submillimeter bands to wavelengths as short as the 200 μm telluric window. The SWCam system consists of 7 sub-cameras that address 4 different telluric windows: 4 subcameras at 350 μm, 1 at 450 μm, 1 at 850 μm, and 1 at 2 mm wavelength. Each sub-camera has a 6’ diameter field of view, so that the total instantaneous field of view for SWCam is equivalent to a 16’ diameter circle. Each focal plane is populated with near unit filling factor arrays of Lumped Element Kinetic Inductance Detectors (LEKIDs) with pixels scaled to subtend an solid angle of (λ/D)2 on the sky. The total pixel count is 57,160. We expect background limited performance at each wavelength, and to be able to map < 35(°)2 of sky to 5 σ on the confusion noise at each wavelength per year with this first light instrument. Our primary science goal is to resolve the Cosmic Far-IR Background (CIRB) in our four colors so that we may explore the star and galaxy formation history of the Universe extending to within 500 million years of the Big Bang. CCAT's large and high-accuracy aperture, its fast slewing speed, use of instruments with large format arrays, and being located at a superb site enables mapping speeds of up to three orders of magnitude larger than contemporary or near future facilities and makes it uniquely sensitive, especially in the short submm bands.

Proceedings Article | 28 July 2014 Paper

Fully cryogenic phased array prototype camera for the Arecibo radio telescope

German Cortes-Medellin, Amit Vishwas, Stephen Parshley, Donald Campbell

Proceedings Volume 9147, 91479Q (2014) https://doi.org/10.1117/12.2054940

KEYWORDS: Cameras, Cryogenics, Foam, Phased arrays, Space telescopes, Prototyping, Radio telescopes, Telescopes, Radio astronomy, Head

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Proceedings Article | 23 July 2014 Paper

Antireflection coatings for submillimeter silicon lenses

Jordan Wheeler, Brian Koopman, Patricio Gallardo, Philip Maloney, Spencer Brugger, German Cortes-Medellin, Rahul Datta, C. Darren Dowell, Jason Glenn, Sunil Golwala, Chris McKenney, Jeffery McMahon, Charles Munson, Mike Niemack, Stephen Parshley, Gordon Stacey

Proceedings Volume 9153, 91532Z (2014) https://doi.org/10.1117/12.2057011

KEYWORDS: Silicon, Antireflective coatings, Coating, Terahertz radiation, Deep reactive ion etching, Lenses, Dielectrics, Absorption, Interfaces, Etching

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Proceedings Article | 27 September 2012 Paper

The CCAT 25m diameter submillimeter-wave telescope

David Woody, Steve Padin, Eric Chauvin, Bruno Clavel, German Cortes, Andy Kissil, John Lou, Paul Rasmussen, David Redding, Jeff Zolkower

Proceedings Volume 8444, 84442M (2012) https://doi.org/10.1117/12.925229

KEYWORDS: Telescopes, Wavefronts, Sensors, Control systems, Actuators, Distortion, Cameras, Reflectors, Image segmentation, Mirrors

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Proceedings Article | 6 August 2010 Paper

CCAT optics

S. Padin, M. Hollister, S. Radford, J. Sayers, D. Woody, J. Zmuidzinas, G. Cortes-Medellin, T. Sebring, G. Stacey

Proceedings Volume 7733, 77334Y (2010) https://doi.org/10.1117/12.856489

KEYWORDS: Cameras, Sensors, Telescopes, Relays, Space telescopes, Mirrors, Scattering, Wavefronts, Spectrometers, Reflectivity

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Proceedings Article | 6 July 2006 Paper

Instrumentation for the CCAT Telescope

G. Stacey, S. Golwala, C. Bradford, C. Dowell, G. Cortes-Medellin, T. Nikola, J. Zmuidzinas, T. Herter, S. Radford, J. Lloyd, A. Blain, R. Brown, D. Campbell, R. Giovanelli, P. Goldsmith, P. Harvey, C. Henderson, W. Langer, T. Phillips, A. C. S. Readhead, D. Woody

Proceedings Volume 6275, 62751G (2006) https://doi.org/10.1117/12.672176

KEYWORDS: Cameras, Sensors, Telescopes, Spectrometers, Multiplexing, Receivers, Bolometers, Antennas, Mirrors, Polarization

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Proceedings Article | 23 June 2006 Paper

Active surface segmentation analysis of CCAT

Germán Cortés-Medellín

Proceedings Volume 6267, 62672X (2006) https://doi.org/10.1117/12.670312

KEYWORDS: Error analysis, Telescopes, Image segmentation, Actuators, Control systems, Reflectors, Monte Carlo methods, Radio telescopes, Calibration, Holography

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Proceedings Article | 23 June 2006 Paper

Optical design of CCAT

Germán Cortés-Medellín, Terry Herter

Proceedings Volume 6267, 62672F (2006) https://doi.org/10.1117/12.670300

KEYWORDS: Telescopes, Reflectors, Antennas, Optical design, Optical instrument design, Monochromatic aberrations, Polarization, Diffraction, Terahertz radiation, Imaging systems

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Proceedings Article | 29 September 2004 Paper

Using an active primary surface to correct for low-order manufacturing errors in secondary mirrors of large reflector antennas

German Cortes-Medellin, Amy Lovell, Rogerio Enriquez, David Smith

Proceedings Volume 5495, (2004) https://doi.org/10.1117/12.550830

KEYWORDS: Antennas, Monochromatic aberrations, Reflectors, Astronomy, Zernike polynomials, Telescopes, Carbon, Manufacturing, Optics manufacturing, Mirrors

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Showing 5 of 14 publications

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