Mr. Javier G. Del Hoyo Profile

Javier G. Del Hoyo

Optical Engineer at NASA Goddard Space Flight Ctr

SPIE Involvement:

Author

Publications (25)

Proceedings Article | 5 October 2023 Presentation + Paper

Presentation + Paper

Status and mission operations of the SPRITE 12U CubeSat: a probe of star formation feedback from stellar to galactic scales with far-UV imaging spectroscopy

Briana Indahl, Brian Fleming, Dmitry Vorobiev, Dana Chafetz, Jack Williams, Maitland Bowen, Diane Brening, Sanchayeeta Borthakur, Javier Del Hoyo, Destry Dewitt, Adriana Diaz, Abigail Durell, Ben Foehr, Kevin France, Sreejith Gopinathan, John Hennessy, Anne Jaskot, Michael Kaiser, Sydney Koehler, Adam Magruder, Adrian Martin, Stephan McCandliss, John O'Meara, Manuel Quijada, Luis Rodríguez-de Marcos, Michael Rotkowski, Ravi Sankrit, Alex Sico, Oswald Siegmund, Daniel Szewczyk, Jason Tumlinson, Stefan Ulrich

Proceedings Volume 12678, 1267806 (2023) https://doi.org/10.1117/12.2677737

KEYWORDS: Astronomical spectroscopy, Equipment, Stars, Galactic astronomy, Microchannel plates, Space operations, Ultraviolet radiation, Calibration, Telescopes, Protective coatings, Mirrors

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Proceedings Article | 4 October 2023 Paper

Paper

Cryolite overcoated aluminum reflectors for far-ultraviolet spectroscopy

Javier Del Hoyo, Luis Rodriguez-de-Marcos, J. Hennessy, M. Batkis, C. Bos, Manuel Quijada

Proceedings Volume 12676, 126760I (2023) https://doi.org/10.1117/12.2678149

KEYWORDS: Aluminum, Reflectivity, Atomic layer deposition, Reflectors, Far ultraviolet, Surface roughness, Spectroscopy, Fluoride, Visible radiation, Reflectance spectroscopy

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Proceedings Article | 4 October 2023 Presentation + Paper

Presentation + Paper

Environmental and polarization characterizations of E-beam plasma-based AlF3-passivated aluminum mirrors for astronomical telescopes

Manuel Quijada, David Boris, Luis Rodriguez de Marcos, Virginia Wheeler, Javier Del Hoyo, Mateo Batkis, Caleb Bos, Scott Walton, Edward Wollack

Proceedings Volume 12676, 126760G (2023) https://doi.org/10.1117/12.2678192

KEYWORDS: Aluminum, Reflectivity, Far ultraviolet, Mirrors, Plasma, Polarization, Passivation, Aluminum mirrors, Optical coatings, Vacuum chambers

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Proceedings Article | 4 October 2023 Poster + Paper

Poster + Paper

Linear polarizer design for application in the far-ultraviolet spectral range

Mateo Batkis, Manuel Quijada, Paul Scowen, Robert Woodruff, Luis Rodriguez de Marcos, Javier del Hoyo, Johnathan Gamaunt

Proceedings Volume 12676, 1267612 (2023) https://doi.org/10.1117/12.2676820

KEYWORDS: Polarizers, Polarization, Mirrors, Laser induced fluorescence, Design and modelling, Far ultraviolet, Optical testing, Mineralogy, Silicon carbide, Refractive index

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Proceedings Article | 4 October 2023 Presentation + Paper

Presentation + Paper

Electron beam-generated plasmas in NF3 environments for the passivation of UV/O/IR mirrors

L. Rodriguez de Marcos, D. Boris, V. Wheeler, M. Batkis, J. Del Hoyo, E. Jin, S. Walton, E. Wollack, M. Quijada

Proceedings Volume 12676, 126760F (2023) https://doi.org/10.1117/12.2678016

KEYWORDS: Aluminum, Far ultraviolet, Optical coatings, Mirrors

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Proceedings Article | 3 October 2022 Paper

Paper

Surface damage catalog for contact-measuring space flight optics using a coordinate measuring machine

Joshua Berrier, Timothy Hahn, David Kubalak, S. Bradley Cenko, Javier Del Hoyo, Severine Tournois, Raymond Ohl

Proceedings Volume 12222, 1222202 (2022) https://doi.org/10.1117/12.2632807

KEYWORDS: Coating, Inspection, Space operations

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Proceedings Article | 31 August 2022 Poster + Paper

Poster + Paper

Plasma based production of AlF3-passivated aluminum mirrors for UVOIR astronomy

D. Boris, L. Rodriguez de Marcos, J. Del Hoyo, V. Wheeler, S. Walton, E. Wollack, M. Quijada

Proceedings Volume 12181, 121813C (2022) https://doi.org/10.1117/12.2631398

KEYWORDS: Plasma, Mirrors, Aluminum, Reflectivity, Plasma systems, Ions, Coating, Electron beams, Astronomy, Ultraviolet radiation

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Advanced Al mirrors protected with LiF overcoat to realize stable mirror coatings for astronomical telescopes

Manuel A. Quijada, Luis V. Rodriguez de Marcos, Javier G. Del Hoyo, Emrold Gray, Edward J. Wollack, Ari Brown

Proceedings Volume 12188, 121881V (2022) https://doi.org/10.1117/12.2630585

KEYWORDS: Mirrors, Aluminum, Reflectivity, Humidity, Fluorine, Surface roughness, Lithium, Interfaces, Analytical research

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Advanced Al/eLiF mirrors for the SPRITE CubeSat

L. Rodríguez-de Marcos, B. Fleming, J. Hennessy, D. Chafetz, J. Del Hoyo, M. Quijada, M. Bowen, D. Vorobiev, B. Indahl

Proceedings Volume 12188, 1218820 (2022) https://doi.org/10.1117/12.2630522

KEYWORDS: Mirrors, Reflectivity, Aluminum, Humidity, Annealing, Optical coatings, Atomic layer deposition, Thin films

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Proceedings Article | 24 August 2021 Presentation + Paper

Presentation + Paper

Advanced AlF3-passivated Aluminum mirrors for UV astronomy

L. Rodríguez-de Marcos, D. Boris, J. Del Hoyo, Virginia Wheeler, Jeffrey Woodward, J. G. Richardson, S. G. Walton, E. J. Wollack, M. A. Quijada

Proceedings Volume 11820, 1182005 (2021) https://doi.org/10.1117/12.2594741

KEYWORDS: Aluminum, Mirrors, Reflectivity, Coating, Plasma, Ultraviolet astronomy

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Efficient ultraviolet (UV) mirrors are essential components in space observatories for UV astronomy. Aluminum mirrors with fluoride-based protective layers are commonly the baseline UV coating technology; these mirrors have been proven to be stable, reliable, and with long flight heritage. However, despite their acceptable optical performance, the single-bounce reflectance values are still too low for use in optical systems in which several reflections are required. Recently, a novel passivation procedure based on the self-fluorination of bare Al has been presented [1, 2]. This research is framed in a collaboration between the Goddard Space Flight Center (GSFC) and the Naval Research Laboratory (NRL), and the experiments are carried out in the Large Area Plasma Processing System (LAPPS) at NRL using bare aluminum samples coated at GSFC coating facilities. The passivation of the oxidized Al is accomplished by using an electron-beam generated plasma produced in a fluorine-containing background to simultaneously remove the native oxide layer while promoting the formation of an AlF₃passivation layer with tunable thickness. Importantly, this new treatment uses benign precursors (SF₆) and does not require high substrate temperatures. This novel procedure has demonstrated improved Al mirrors with enhanced FUV reflectivity. Examples of mirrors tuned at several key FUV wavelengths are provided. The LAPPS has been recently upgraded to include a new spectroscopic ellipsometer for real-time, in situ measurements of film thickness and optical constants of the fluoride layer during the plasma treatment. Since this new capability requires precise knowledge of the complex refractive index (n,k) of AlF₃, we present optical constants in the 90-2500 nm range obtained from Al mirrors previously prepared using the LAPPS process. The derived optical properties from the AlF₃ passivation layer show similar optical properties in the FUV when compared with PVD- and ALD- hot-deposited AlF₃.

Proceedings Article | 20 August 2021 Presentation + Paper

Presentation + Paper

Influence of evaporation rate and chamber pressure on the FUV reflectance and physical characteristics of aluminum films

Manuel Quijada, Javier Del Hoyo, Emrold Gray, J. Grabriel Richardson, Andrew Howe, Luis Rodriguez de Marcos, David Sheikh

Proceedings Volume 11819, 118190G (2021) https://doi.org/10.1117/12.2595392

KEYWORDS: Aluminum, Reflectivity, Mirrors, Optical coatings, Deposition processes, Chemical species, Molecules, Thin films, Surface plasmons, Telescopes

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Proceedings Article | 14 December 2020 Poster + Paper

Poster + Paper

Far-UV multi-object spectroscopy with digital micromirror devices (DMDs)

Dmitry Vorobiev, Brian Fleming, Kathleen Oram, Dana Chafetz, Peter Zimmer, Alexis Irwin, Javier Del Hoyo, Manuel Quijada, Zoran Ninkov

Proceedings Volume 11444, 114446Y (2020) https://doi.org/10.1117/12.2562540

KEYWORDS: Digital micromirror devices, Astronomical imaging, Spectroscopes, Spectrographs, Molybdenum, Mirrors, Reflectivity, Telescopes, Adaptive optics, Space operations

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Proceedings Article | 12 September 2019 Paper

Paper

ZERODUR(R) substrates for application of high-temperature protected-aluminum far-ultraviolet coatings

Manuel Quijada, David Sheikh, Javier Del Hoyo, J. Gabriel Richardson

Proceedings Volume 11116, 111160T (2019) https://doi.org/10.1117/12.2530585

KEYWORDS: Far ultraviolet, Mirrors, Optical coatings, Reflectivity, Laser induced fluorescence, Deposition processes, Aluminum, Magnesium fluoride, Ultraviolet radiation, Temperature metrology

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Proceedings Article | 9 September 2019 Presentation + Paper

Presentation + Paper

Mathematical analysis of hexagonal source arrangement for making uniform reflective aluminum coatings

D. Sheikh, Manuel Quijada, Javier Del Hoya, Joseph Richardson

Proceedings Volume 11116, 111160Q (2019) https://doi.org/10.1117/12.2529530

KEYWORDS: Mirrors, Aluminum, Monte Carlo methods, Reflectivity, Mathematics, Optimization (mathematics), Error analysis, Mathematical modeling, Computer simulations, Thin film coatings

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Proceedings Article | 12 July 2018 Presentation + Paper

Presentation + Paper

Development of digital micromirror devices (DMDs) for far-UV applications

Dmitry Vorobiev, Javier Del Hoyo, Manuel Quijada, Anton Travinsky, Alan Raisanen, Alexis Irwin, Zoran Ninkov

Proceedings Volume 10706, 107062F (2018) https://doi.org/10.1117/12.2313755

KEYWORDS: Digital micromirror devices, Reflectivity, Coating, Aluminum, Mirrors, Spectrometers, Micromirrors, Spectrophotometry, Astronomical imaging, Molybdenum

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Proceedings Article | 6 July 2018 Paper

Paper

E-beam generated plasma etching for developing high-reflectance mirrors for far-ultraviolet astronomical instrument applications

Manuel Quijada, David Boris, Javier del Hoyo, Edward Wollack, Alexander Kozen, Scott Walton, Vivek Dwivedi

Proceedings Volume 10699, 106992X (2018) https://doi.org/10.1117/12.2314391

KEYWORDS: Aluminum, Reflectivity, Plasma, Mirrors, Ions, Optical coatings, Etching, Oxides, Plasma systems, Laser induced fluorescence

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Proceedings Article | 5 September 2017 Paper

Paper

Enhanced aluminum reflecting and solar-blind filter coatings for the far-ultraviolet

Javier Del Hoyo, Manuel Quijada

Proceedings Volume 10372, 1037204 (2017) https://doi.org/10.1117/12.2274399

KEYWORDS: Aluminum, Thin film coatings, Optical coatings, Bandpass filters, Ultraviolet radiation, Reflectors, Ultraviolet coatings, UV optics

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Proceedings Article | 5 September 2017 Paper

Paper

Mirror coatings for large aperture UV optical infrared telescope optics

Kunjithapatham Balasubramanian, John Hennessy, Nasrat Raouf, Shouleh Nikzad, Javier Del Hoyo, Manuel Quijada

Proceedings Volume 10398, 103980X (2017) https://doi.org/10.1117/12.2274794

KEYWORDS: Space telescopes, Mirrors, Optical coatings, Near infrared, Ultraviolet radiation, Infrared telescopes, Aluminum, Reflectivity, Telescopes, Atomic layer deposition

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Proceedings Article | 5 September 2017 Paper

Paper

Improved mirror coatings for use in the Lyman Ultraviolet to enhance astronomical instrument capabilities

Manuel Quijada, Javier del Hoyo, David Boris, Scott Walton

Proceedings Volume 10398, 103980Z (2017) https://doi.org/10.1117/12.2274790

KEYWORDS: Aluminum, Reflectivity, Laser induced fluorescence, Optical coatings, Plasma, Mirrors, Plasma etching, Etching, Oxides, Argon

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Proceedings Article | 31 August 2017 Presentation + Paper

Presentation + Paper

The development and characterization of advanced broadband mirror coatings for the far-UV

Arika Egan, Brian Fleming, James Wiley, Manuel Quijada, Javier Del Hoyo, John Hennessy, Brian Hicks, Kevin France, Nicholas Kruczek, Nicholas Erickson

Proceedings Volume 10397, 1039715 (2017) https://doi.org/10.1117/12.2274141

KEYWORDS: Optical coatings, Mirrors, Atomic layer deposition, Reflectivity, Imaging spectroscopy, Ultraviolet radiation, Polarization, Physical vapor deposition, Space mirrors, Thin film coatings

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Proceedings Article | 11 July 2016 Paper

Paper

SISTINE: a pathfinder for FUV imaging spectroscopy on future NASA astrophysics missions

Brian Fleming, Kevin France, Nicholas Nell, Nicholas Kruczek, Robert Kane, James Green, Manuel Quijada, Javier Del Hoyo, Oswald Siegmund

Proceedings Volume 9905, 99050A (2016) https://doi.org/10.1117/12.2232249

KEYWORDS: Ultraviolet radiation, Mirrors, Spectrographs, Polarization, Wave plates, Magnesium, Coating, Magnetism, Cameras, Zeeman effect

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Proceedings Article | 22 September 2015 Paper

Paper

Coatings for UVOIR telescope mirrors

Kunjithapatham Balasubramanian, John Hennessy, Nasrat Raouf, Shouleh Nikzad, Michael Ayala, Stuart Shaklan, Paul Scowen, Javier Del Hoyo, Manuel Quijada

Proceedings Volume 9602, 96020I (2015) https://doi.org/10.1117/12.2188981

KEYWORDS: Aluminum, Reflectivity, Atomic layer deposition, Mirrors, Diagnostics, Magnesium fluoride, Oxides, Ultraviolet radiation, Laser induced fluorescence, Space telescopes

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Proceedings Article | 24 August 2015 Paper

Paper

New UV instrumentation enabled by enhanced broadband reflectivity lithium fluoride coatings

Brian Fleming, Manuel Quijada, Kevin France, Keri Hoadley, Javier Del Hoyo, Nicholas Kruczek

Proceedings Volume 9601, 96010R (2015) https://doi.org/10.1117/12.2190556

KEYWORDS: Optical coatings, Laser induced fluorescence, Calibration, Mirrors, Ultraviolet radiation, Humidity, Aluminum, Sensors, Spectrographs, Space telescopes

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Proceedings Article | 24 July 2014 Paper

Paper

Enhanced far-ultraviolet reflectance of MgF2 and LiF over-coated Al mirrors

Manuel Quijada, Javier Del Hoyo, Stephen Rice

Proceedings Volume 9144, 91444G (2014) https://doi.org/10.1117/12.2057438

KEYWORDS: Coating, Magnesium fluoride, Reflectivity, Aluminum, Mirrors, Laser induced fluorescence, Absorption, Space telescopes, Crystals, Dielectrics

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Proceedings Article | 7 September 2013 Paper

Paper

Super-smooth optical fabrication controlling high-spatial frequency surface irregularity

Javier Del Hoyo, Dae Wook Kim, James Burge

Proceedings Volume 8838, 88380T (2013) https://doi.org/10.1117/12.2022924

KEYWORDS: Polishing, Surface finishing, Spatial frequencies, Interfaces, Surface roughness, Zerodur, Polyurethane, Optical fabrication, Objectives, Abrasives

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Showing 5 of 25 publications

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