Dr. Jonathan L. Kuhn Profile

Dr. Jonathan L. Kuhn

Senior Biomedical Engineer at Medronic Inc

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Publications (9)

Proceedings Article | 19 August 2005 Paper

Design/analysis of the JWST ISIM bonded joints for survivability at cryogenic temperatures

Andrew Bartoszyk, John Johnston, Charles Kaprielian, Jonathan Kuhn, Cengiz Kunt, Benjamin Rodini, Daniel Young

Proceedings Volume 5868, 58680K (2005) https://doi.org/10.1117/12.619011

KEYWORDS: Failure analysis, Composites, Interfaces, Received signal strength, Cryogenics, Finite element methods, Adhesives, Chemical elements, James Webb Space Telescope, Analytical research

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Proceedings Article | 22 August 2000 Paper

Development of individually addressable micromirror arrays for space applications

Sanghamitra Dutta, Audrey Ewin, Murzy Jhabvala, Carl Kotecki, Jonathan Kuhn, David Mott

Proceedings Volume 4178, (2000) https://doi.org/10.1117/12.396508

KEYWORDS: Mirrors, Aluminum, Micromirrors, Microelectromechanical systems, Space telescopes, Astronomy, Semiconducting wafers, Cryogenics, Imaging spectroscopy, Electrodes

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Proceedings Article | 22 August 2000 Paper

Electromechanical simulation of a large-aperture MOEMS Fabry-Perot tunable filter

Jonathan Kuhn, Richard Barclay, Matthew Greenhouse, David Mott, Shobita Satyapal

Proceedings Volume 4178, (2000) https://doi.org/10.1117/12.396504

KEYWORDS: Fabry–Perot interferometers, Coating, Silicon, Actuators, Semiconducting wafers, Microelectromechanical systems, Dielectrics, Servomechanisms, Tunable filters, Reflectors

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Proceedings Article | 10 August 2000 Paper

Fracture tests of etched components using a focused ion beam machine

Jonathan Kuhn, Rainer Fettig, Samuel Moseley, Alexander Kutyrev, Jon Orloff

Proceedings Volume 4180, (2000) https://doi.org/10.1117/12.395707

KEYWORDS: Silicon, Failure analysis, Ion beams, Finite element methods, Reactive ion etching, Camera shutters, Standards development, Statistical analysis, Ions, Cryogenics

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Proceedings Article | 28 July 2000 Paper

Near-IR Fabry-Perot interferometer for widefield low-resolution hyperspectral imaging on the Next Generation Space Telescope

Richard Barry, Shobita Satyapal, Matthew Greenhouse, Richard Barclay, Deborah Amato, Brandon Arritt, Gary Brown, Vanessa Harvey, Christopher Holt, Jonathan Kuhn, Lawrence Lesyna, Nils Fonneland, Theodore Hilgeman

Proceedings Volume 4013, (2000) https://doi.org/10.1117/12.393959

KEYWORDS: Fabry–Perot interferometers, Actuators, Cryogenics, Aluminum, Sensors, Cameras, Ferroelectric materials, Tunable filters, Space telescopes, Optical filters

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Proceedings Article | 1 October 1999 Paper

Design and fabrication of novel photodetector arrays

Mary Li, Christine Allen, Shahid Aslam, Tina Chen, Fred Finkbeiner, Scott Gordon, Jonathan Kuhn, David Mott, Carl Stahle, Caroline Stahle, Nilesh Tralshawala, Liqin Wang

Proceedings Volume 3892, (1999) https://doi.org/10.1117/12.364483

KEYWORDS: Molybdenum, Silicon, Sensors, Superconductors, Gold, Silver, Scanning electron microscopy, Semiconducting wafers, Aluminum, Detector arrays

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Proceedings Article | 28 September 1999 Paper

Thermal and mechanical performance of a carbon-carbon composite spacecraft radiator

Jonathan Kuhn, Steve Benner, C. Dan Butler, Eric Silk

Proceedings Volume 3786, (1999) https://doi.org/10.1117/12.363792

KEYWORDS: Space operations, Aluminum, Composites, Thermal modeling, Electronics, Finite element methods, Inspection, Carbon, Safety, Analytical research

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Proceedings Article | 3 September 1999 Paper

Some aspects on the mechanical analysis of microshutters

Rainer Fettig, Jonathan Kuhn, Samuel Moseley, Alexander Kutyrev, Jon Orloff, Shude Lu

Proceedings Volume 3875, (1999) https://doi.org/10.1117/12.360473

KEYWORDS: Camera shutters, Silicon, Finite element methods, Lanthanum, Ion beams, Coating, Crystals, Data modeling, Prototyping, Analytical research

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Proceedings Article | 30 August 1999 Paper

Fabrication of pop-up detector arrays on Si wafers

Mary Li, Christine Allen, Scott Gordon, Jonathan Kuhn, David Mott, Caroline Stahle, Liqin Wang

Proceedings Volume 3874, (1999) https://doi.org/10.1117/12.361247

KEYWORDS: Sensors, Silicon, Detector arrays, Semiconducting wafers, Structural design, Scanning electron microscopy, Infrared sensors, Computer simulations, Infrared bolometers, X-rays

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High sensitivity is a basic requirement for a new generation of thermal detectors. To meet the requirement, close-packed, 2D silicon detector arrays have been developed in NASA Goddard Space Flight Center. The goal of the task is to fabricate detector arrays configured with thermal detectors such as IR bolometers and x-ray calorimeters to use in space flight missions. This paper focuses on the fabrication and the mechanical testing of detector arrays in a 0.2 mm pixel size, the smallest pop-up detectors being developed so far. These array structures, nicknamed 'PUDs' for 'Pop-Up Detectors', are fabricated on 1 micrometers thick, single-crystal, silicon membranes. Their designs have been refined so we can utilize the flexibility of thin silicon films by actually folding the silicon membranes to 90 degrees in order to obtain close-packed 2D arrays. The PUD elements consist of a detector platform and two legs for mechanical support while also serving as electrical and thermal paths. Torsion bars and cantilevers connecting the detector platform to the legs provide additional flexures for strain relief. Using micro- electromechanical structure fabrication techniques, including photolithography, anisotropic chemical etching, reactive-ion etching, and laser dicing, we have fabricated PUD detector arrays of fourteen designs with a variation of four parameters including cantilever length, torsion bar length and width, and leg length. Folding test were conducted to test mechanical stress distribution for the array structures. We obtained folding yields and selected optimum design parameters to reach minimal stress levels. Computer simulation was also employed to verify mechanical behaviors of PUDs in the folding process. In addition, scanning electron microscopy was utilized to examine the flatness of detectors and the alignment of detector pixels in arrays. The fabrication of thermistor and heaters on the pop-up detectors is under way, preparing us for the next step of the experiment, the thermal test.

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