Dr. Karwan Rostem Profile

Dr. Karwan Rostem

Researcher at NASA Goddard Space Flight Ctr

SPIE Involvement:

Author

Publications (18)

Proceedings Article | 31 August 2022 Poster + Paper

Poster + Paper

Design and characterization of new 90 GHz detectors for the Cosmology Large Angular Scale Surveyor (CLASS)

Carolina Nunez, John Appel, Sarah Marie Bruno, Rahul Datta, Aamir Ali, Charles Bennett, Sumit Dahal, Jullianna Denes Couto, Kevin Denis, Joseph Eimer, Francisco Espinoza, Tom Essinger-Hileman, Kyle Helson, Jeffrey Iuliano, Tobias Marriage, Carolina Morales Peréz, Deniz Augusto Nunes Valle, Matthew Petroff, Karwan Rostem, Rui Shi, Duncan Watts, Edward Wollack, Zhilei Xu

Proceedings Volume 12190, 121901J (2022) https://doi.org/10.1117/12.2630081

KEYWORDS: Sensors, Bolometers, Telescopes, Staring arrays, Silicon, Polarization, Microwave radiation, Wafer-level optics, Detector arrays, Astronomical instrumentation, Detector development, Superconducting detectors, Astronomical telescopes

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Proceedings Article | 31 August 2022 Poster + Paper

Poster + Paper

Cosmology Large Angular Scale Surveyor (CLASS): pointing stability and beam measurements at 90, 150, and 220 GHz

Rahul Datta, Michael Brewer, Jullianna Couto, Joseph Eimer, Yunyang Li, Zhilei Xu, John Appel, Ricardo Bustos, David Chuss, Joseph Cleary, Sumit Dahal, Thomas Essinger-Hileman, Jeffrey Iuliano, Tobias Marriage, Carolina Nunez, Matthew Petroff, Karwan Rostem, Duncan Watts, Edward Wollack

Proceedings Volume 12190, 121902S (2022) https://doi.org/10.1117/12.2630649

KEYWORDS: Telescopes, Polarization, Receivers, Calibration, Optical testing, Physics

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Proceedings Article | 29 May 2019 Paper

Paper

Fabrication of phononic filter structures for far-IR/sub-mm detector applications

Kevin Denis, Karwan Rostem, Marco Sagliocca, Elissa Williams, Edward Wollack

Proceedings Volume 10927, 1092720 (2019) https://doi.org/10.1117/12.2506387

KEYWORDS: Semiconducting wafers, Etching, Sensors, Silicon, Electron beam lithography, Gold, Bolometers, Niobium, Deep reactive ion etching, Optical filters

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Proceedings Article | 10 July 2018 Paper

Paper

The Cosmology Large Angular Scale Surveyor receiver design

Jeffrey Iuliano, Joseph Eimer , Lucas Parker, Gary Rhoades, Aamir Ali, John Appel, Charles Bennett , Michael Brewer , Ricardo Bustos , David Chuss , Joseph Cleary , Jullianna Couto, Sumit Dahal, Kevin Denis, Rolando Dünner , Thomas Essinger-Hileman, Pedro Fluxa , Mark Halpern , Kathleen Harrington , Kyle Helson, Gene Hilton , Gary Hinshaw , Johannes Hubmayr , John Karakla , Tobias Marriage , Nathan Miller , Jeffrey John McMahon, Carolina Nuñez, Ivan Padilla , Gonzalo Palma , Matthew Petroff , Bastian Pradenas Márquez, Rodrigo Reeves , Carl Reintsema , Karwan Rostem , Deniz Augusto Nunes Valle, Trevor Van Engelhoven, Bingjie Wang , Qinan Wang , Duncan Watts , Janet Weiland , Edward Wollack , Zhilei Xu, Ziang Yan , Lingzhen Zeng

Proceedings Volume 10708, 1070828 (2018) https://doi.org/10.1117/12.2312954

KEYWORDS: Receivers, Sensors, Tolerancing, Lenses, Magnetism, Optical alignment, Polarization, Absorption filters

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Proceedings Article | 9 July 2018 Paper

Paper

Variable-delay polarization modulators for the CLASS telescopes

Kathleen Harrington, Joseph Eimer, David Chuss, Matthew Petroff, Joseph Cleary, Martin DeGeorge, Theodore Grunberg, Aamir Ali, John Appel, Charles Bennett, Michael Brewer, Ricardo Bustos, Manwei Chan, Jullianna Couto, Sumit Dahal, Kevin Denis, Rolando Dünner, Thomas Essinger-Hileman, Pedro Fluxa, Mark Halpern, Gene Hilton, Gary Hinshaw, Johannes Hubmayr, Jeffrey Iuliano, John Karakla, Tobias Marriage, Jeffrey McMahon, Nathan Miller, Carolina Nuñez, Ivan Padilla, Gonzalo Palma, Lucas Parker, Bastian Pradenas Marquez, Rodrigo Reeves, Carl Reintsema, Karwan Rostem, Deniz Augusto Nunes Valle, Trevor Van Engelhoven, Bingjie Wang, Qinan Wang, Duncan Watts, Janet Weiland, Edward Wollack, Zhilei Xu, Ziang Yan, Lingzhen Zeng

Proceedings Volume 10708, 107082M (2018) https://doi.org/10.1117/12.2313614

KEYWORDS: Polarization, Telescopes, Modulation, Sensors, Computer programming, Control systems, Microscopes, Modulators, Microwave radiation, Physical cosmology

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The search for inflationary primordial gravitational waves and the measurement of the optical depth to reionization, both through their imprint on the large angular scale correlations in the polarization of the cosmic microwave background (CMB), has created the need for high sensitivity measurements of polarization across large fractions of the sky at millimeter wavelengths. These measurements are subject to instrumental and atmospheric 1=f noise, which has motivated the development of polarization modulators to facilitate the rejection of these large systematic effects.

Variable-delay polarization modulators (VPMs) are used in the Cosmology Large Angular Scale Surveyor (CLASS) telescopes as the first element in the optical chain to rapidly modulate the incoming polarization. VPMs consist of a linearly polarizing wire grid in front of a movable flat mirror. Varying the distance between the grid and the mirror produces a changing phase shift between polarization states parallel and perpendicular to the grid which modulates Stokes U (linear polarization at 45°) and Stokes V (circular polarization). The CLASS telescopes have VPMs as the first optical element from the sky; this simultaneously allows a lock-in style polarization measurement and the separation of sky polarization from any instrumental polarization further along in the optical path.

The CLASS VPM wire grids use 50 μm copper-plated tungsten wire with a 160μm spacing across a 60 cm clear aperture. The mirror is mounted on a flexure system with one degree of translational freedom, enabling the required mirror motion while maintaining excellent parallelism with respect to the wire grid. The wire grids and mirrors are held parallel to each other to better than 80 μm, and the wire grids have RMS flatness errors below 50 μm across the 60 cm aperture. The Q-band CLASS VPM was the first VPM to begin observing the CMB full time, starting in the Spring of 2016. The first W-band CLASS VPM was installed in the Spring of 2018.

Proceedings Article | 9 July 2018 Paper

Paper

Design and characterization of the Cosmology Large Angular Scale Surveyor (CLASS) 93 GHz focal plane

Sumit Dahal, Aamir Ali, John Appel, Thomas Essinger-Hileman, Charles Bennett, Michael Brewer, Ricardo Bustos, Manwei Chan, David Chuss, Joseph Cleary, Felipe Colazo, Jullianna Couto, Kevin Denis, Rolando Dünner, Joseph Eimer, Trevor Engelhoven, Pedro Fluxa, Mark Halpern, Kathleen Harrington, Kyle Helson, Gene Hilton, Gary Hinshaw, Johannes Hubmayr, Jeffery Iuliano, John Karakla, Tobias Marriage, Jeffrey McMahon, Nathan Miller, Carolina Nuñez, Ivan Padilla, Gonzalo Palma, Lucas Parker, Matthew Petroff, Bastian Pradenas, Rodrigo Reeves, Carl Reintsema, Karwan Rostem, Marco Sagliocca, Kongpop U-Yen, Deniz Valle, Bingjie Wang, Qinan Wang, Duncan Watts, Janet Weiland, Edward Wollack, Zhilei Xu, Ziang Yan, Lingzhen Zeng

Proceedings Volume 10708, 107081Y (2018) https://doi.org/10.1117/12.2311812

KEYWORDS: Sensors, Polarization, Signal detection, Detector arrays, Telescopes, Silicon, Receivers, Bolometers, Superconducting detectors

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Proceedings Article | 9 July 2018 Presentation + Paper

Presentation + Paper

Aerogel scattering filters for cosmic microwave background observations

Thomas Essinger-Hileman, Charles Bennett, Lance Corbett, Haiquan Guo, Tobias Marriage, Mary Ann Meador, Karwan Rostem, Edward Wollack

Proceedings Volume 10708, 107080F (2018) https://doi.org/10.1117/12.2313387

KEYWORDS: Scattering, Optical filters, Terahertz radiation, Dielectrics, Infrared radiation

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Proceedings Article | 9 July 2018 Presentation + Paper

Presentation + Paper

Development of a robust, efficient process to produce scalable, superconducting kilopixel far-IR detector arrays

Johannes Staguhn, Samuel Moseley, Ari Brown, Gene Hilton, Kent Irwin, Stephen Maher, Karwan Rostem, Elmer Sharp, Edward Wollack

Proceedings Volume 10708, 107081V (2018) https://doi.org/10.1117/12.2312737

KEYWORDS: Sensors, Semiconducting wafers, Detector arrays, Multiplexers, Superconductors, Detector development, Photomasks, Indium, Standards development, Bolometers

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Proceedings Article | 9 July 2018 Paper

Paper

SiAl alloy feedhorn arrays: material properties, feedhorn design, and astrophysical applications

Aamir Ali, Thomas Essinger-Hileman, Tobias Marriage, John Appel, Charles Bennett, Matthew Berkeley, Berhanu Bulcha, Sumit Dahal, Kevin Denis, Karwan Rostem, Kongpop U-Yen, Edward Wollack, Lingzhen Zeng

Proceedings Volume 10708, 107082P (2018) https://doi.org/10.1117/12.2312817

KEYWORDS: Silicon, Sensors, Aluminum, Copper, Cryogenics, Temperature metrology, Interfaces, Waveguides, Gold, Packaging

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Proceedings Article | 27 July 2016 Paper

Paper

Silicon-based antenna-coupled polarization-sensitive millimeter-wave bolometer arrays for cosmic microwave background instruments

Karwan Rostem, Aamir Ali, John Appel, Charles Bennett, Ari Brown, Meng-Ping Chang, David Chuss, Felipe Colazo, Nick Costen, Kevin Denis, Tom Essinger-Hileman, Ron Hu, Tobias Marriage, Samuel Moseley, Thomas Stevenson, Kongpop U-Yen, Edward Wollack, Zhilei Xu

Proceedings Volume 9914, 99140D (2016) https://doi.org/10.1117/12.2234308

KEYWORDS: Microwave radiation, Silicon, Sensors, Bolometers, Detector arrays, Dielectrics, Semiconducting wafers, Niobium, Waveguides, Aerospace engineering

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Proceedings Article | 19 July 2016 Paper

Paper

The Cosmology Large Angular Scale Surveyor

Kathleen Harrington, Tobias Marriage, Aamir Ali, John Appel, Charles Bennett, Fletcher Boone, Michael Brewer, Manwei Chan, David Chuss, Felipe Colazo, Sumit Dahal, Kevin Denis, Rolando Dünner, Joseph Eimer, Thomas Essinger-Hileman, Pedro Fluxa, Mark Halpern, Gene Hilton, Gary Hinshaw, Johannes Hubmayr, Jeffrey Iuliano, John Karakla, Jeff McMahon, Nathan Miller, Samuel Moseley, Gonzalo Palma, Lucas Parker, Matthew Petroff, Bastián Pradenas, Karwan Rostem, Marco Sagliocca, Deniz Valle, Duncan Watts, Edward Wollack, Zhilei Xu, Lingzhen Zeng

Proceedings Volume 9914, 99141K (2016) https://doi.org/10.1117/12.2233125

KEYWORDS: Polarization, Telescopes, Sensors, Space telescopes, Mirrors, Receivers, Modulation, Lenses, Optical filters, Physics

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Proceedings Article | 23 July 2014 Paper

Paper

The cosmology large angular scale surveyor (CLASS): 38-GHz detector array of bolometric polarimeters

John Appel, Aamir Ali, Mandana Amiri, Derek Araujo, Charles Bennet, Fletcher Boone, Manwei Chan, Hsiao-Mei Cho, David Chuss, Felipe Colazo, Erik Crowe, Kevin Denis, Rolando Dünner, Joseph Eimer, Thomas Essinger-Hileman, Dominik Gothe, Mark Halpern, Kathleen Harrington, Gene Hilton, Gary Hinshaw, Caroline Huang, Kent Irwin, Glenn Jones, John Karakula, Alan Kogut, David Larson, Michele Limon, Lindsay Lowry, Tobias Marriage, Nicholas Mehrle, Amber Miller, Nathan Miller, Samuel Moseley, Giles Novak, Carl Reintsema, Karwan Rostem, Thomas Stevenson, Deborah Towner, Kongpop U-Yen, Emily Wagner, Duncan Watts, Edward Wollack, Zhilei Xu, Lingzhen Zeng

Proceedings Volume 9153, 91531J (2014) https://doi.org/10.1117/12.2056530

KEYWORDS: Sensors, Bolometers, Technetium, Semiconducting wafers, Terbium, Silicon, Polarimetry, Polarization, Waveguides, Interference (communication)

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Proceedings Article | 23 July 2014 Paper

Paper

Scalable background-limited polarization-sensitive detectors for mm-wave applications

Karwan Rostem, Aamir Ali, John Appel, Charles Bennett, David Chuss, Felipe Colazo, Erik Crowe, Kevin Denis, Tom Essinger-Hileman, Tobias Marriage, Samuel Moseley, Thomas Stevenson, Deborah Towner, Kongpop U-Yen, Edward Wollack

Proceedings Volume 9153, 91530B (2014) https://doi.org/10.1117/12.2057266

KEYWORDS: Sensors, Silicon, Microwave radiation, Bolometers, Semiconducting wafers, Dielectrics, Waveguides, Fabrication, Dielectric polarization, Polarimetry

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Proceedings Article | 23 July 2014 Paper

Paper

CLASS: the cosmology large angular scale surveyor

Thomas Essinger-Hileman, Aamir Ali, Mandana Amiri, John Appel, Derek Araujo, Charles Bennett, Fletcher Boone, Manwei Chan, Hsiao-Mei Cho, David Chuss, Felipe Colazo, Erik Crowe, Kevin Denis, Rolando Dünner, Joseph Eimer, Dominik Gothe, Mark Halpern, Kathleen Harrington, Gene Hilton, Gary Hinshaw, Caroline Huang, Kent Irwin, Glenn Jones, John Karakla, Alan Kogut, David Larson, Michele Limon, Lindsay Lowry, Tobias Marriage, Nicholas Mehrle, Amber Miller, Nathan Miller, Samuel Moseley, Giles Novak, Carl Reintsema, Karwan Rostem, Thomas Stevenson, Deborah Towner, Kongpop U-Yen, Emily Wagner, Duncan Watts, Edward Wollack, Zhilei Xu, Lingzhen Zeng

Proceedings Volume 9153, 91531I (2014) https://doi.org/10.1117/12.2056701

KEYWORDS: Sensors, Polarization, Telescopes, Receivers, Modulation, Dielectric polarization, Mirrors, Optical filters, Reflectors, Optical components

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Proceedings Article | 24 September 2012 Paper

Paper

Detector architecture of the cosmology large angular scale surveyor

K. Rostem, C. Bennett, D. Chuss, N. Costen, E. Crowe, K. Denis, J. Eimer, N. Lourie, T. Essinger-Hileman, T. Marriage, S. Moseley, T. Stevenson, D. Towner, G. Voellmer, E. Wollack, L. Zeng

Proceedings Volume 8452, 84521N (2012) https://doi.org/10.1117/12.927056

KEYWORDS: Sensors, Waveguides, Silicon, Semiconducting wafers, Metals, Calibration, Microwave radiation, Polarization, Bolometers, Stray light

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Proceedings Article | 15 July 2010 Paper

Paper

The Primordial Inflation Polarization Explorer (PIPER)

David Chuss, Peter A. Ade, Dominic Benford, Charles Bennett, Jessie Dotson, Joseph Eimer, Dale Fixsen, Mark Halpern, Gene Hilton, James Hinderks, Gary Hinshaw, Kent Irwin, Michael Jackson, Muzariatu Jah, Nikhil Jethava, Christine Jhabvala, Alan Kogut, Luke Lowe, Nuala McCullagh, Timothy Miller, Paul Mirel, S. Harvey Moseley, Samelys Rodriguez, Karwan Rostem, Elmer Sharp, Johannes Staguhn, Carole Tucker, George Voellmer, Edward Wollack, Lingzhen Zeng

Proceedings Volume 7741, 77411P (2010) https://doi.org/10.1117/12.857119

KEYWORDS: Polarization, Sensors, Telescopes, Modulation, Modulators, Dielectric polarization, Microwave radiation, Anisotropy, Physics, Liquids

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Proceedings Article | 15 July 2010 Paper

Paper

5,120 superconducting bolometers for the PIPER balloon-borne CMB polarization experiment

Dominic Benford, David Chuss, Gene Hilton, Kent Irwin, Nikhil Jethava, Christine Jhabvala, Alan Kogut, Timothy Miller, Paul Mirel, S. Harvey Moseley, Karwan Rostem, Elmer Sharp, Johannes Staguhn, Gregory Stiehl, George Voellmer, Edward Wollack

Proceedings Volume 7741, 77411Q (2010) https://doi.org/10.1117/12.856491

KEYWORDS: Sensors, Bolometers, Superconductors, Multiplexers, Polarization, Resistance, Semiconducting wafers, Magnetism, Telescopes, Indium

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Proceedings Article | 18 July 2008 Paper

Paper

Thermal conductance measurements for the development of ultra low-noise transition-edge sensors with a new method for measuring the noise equivalent power

Karwan Rostem, Dorota Glowacka, David Goldie, Stafford Withington

Proceedings Volume 7020, 70200L (2008) https://doi.org/10.1117/12.787372

KEYWORDS: Bridges, Resistors, Phonons, Sensors, Temperature metrology, Black bodies, Solids, Modulation, Thermometry, Convection

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Showing 5 of 18 publications

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