John Ward's Publications List

• John S. Ward, Jonas Zmuidzinas, Andrew I. Harris, and Kate G. Isaak, A ¹²CO J = 6-5 Map of M82: The Significance of Warm Molecular Gas, The Astrophysical Journal, 587: 171-185, 2003 April 10.

• John S. Ward, Observations of Carbon Monoxide in the Starburst Galaxy M82 with a 690 GHz Wide Spectral Bandwidth Receiver, Ph.D. Thesis, California Institute of Technology, 2002.

• J. Ward, D. Miller, J. Zmuidzinas, P. O'Brien, H. G. LeDuc, R. Bicknell-Tassius, A 4-8 GHz Quasi-MMIC IF Amplifier for a 690 GHz SIS Receiver, Proceedings, Eleventh International Symposium on Space Terahertz Technology, pp. 570-581, 2000.

• J. Ward, F. Rice, G. Chattopadhyay, and J. Zmuidzinas, SuperMix: A Flexible Software Library for High-Frequency Circuit Simulation, Including SIS Mixers and Superconducting Elements, Proceedings, Tenth International Symposium on Space Terahertz Technology, pp. 268-281, 1999.

• F. Rice, J. Ward, J. Zmuidzinas, G. Chattopadhyay, Fast Harmonic Balance of SIS Mixers with Multiple Junctions and Superconducting Circuits, Proceedings, Tenth International Symposium on Space Terahertz Technology, pp. 282-297, 1999.

• J.C. Pearson, I. Mehdi, E. Schlecht, F. Maiwald, A. Maestrini, J. Gill, S. Martin, D. Pukala, J. Ward, J. Kawamura, W.R. McGrath, W.A. Hatch, D. Harding, H.G. LeDuc, J.A. Stern, B. Bumble, L. Samoska, T. Gaier, R. Ferber, D. Miller, A. Karpov, J. Zmuidzinas, T. Phillips, N. Erickson, J. Swift, Y.-H. Chung, R. Lai, and H. Wang, THz Frequency Receiver Instrumentation for Herschel's Heterodyne Instrument for Far Infrared (HIFI), Proceedings SPIE, Astronomical Telescopes and Instrumentation, Waikoloa, Hawaii, 22-28 August 2002.

• John Ward, Frank Maiwald, Goutam Chattopadhyay, Erich Schlecht, Alain Maestrini, John Gill, and Imran Mehdi, 1400 - 1900 GHz Local Oscillators for the Herschel Space Observatory, Proceedings, Fourteenth International Symposium on Space Terahertz Technology, pp. 94-101, Tucson, Arizona, 2003.

• A. Maestrini, J. Ward, J. Gill, G. Chattopadhyay, F. Maiwald, K. Ellis, H. Javadi, and I. Mehdi, A Planar-Diode Frequency Tripler at 1.9 THz, 2003 IEEE MTT-S International Microwave Symposium Digest, Philadelphia, PA, June 2003.

• Frank Maiwald, Erich Schlecht, John Ward, Robert Lin, Rosa Leon, John Pearson, and Imran Mehdi, Design and Operational Considerations for Robust Planar GaAs Varactors: A Reliability Study, Proceedings, Fourteenth International Symposium on Space Terahertz Technology, 2003.

• G. Chattopadhyay, E. Schlecht, J. Ward, J. Gill, H. Javadi, F. Maiwald, and I. Mehdi, An All Solid-State Broadband Frequency Multiplier Chain at 1500 GHz, IEEE Transactions on Microwave Theory and Techniques, vol. 52, no. 5, pp. 1538-1547, May 2004.

• A. Maestrini, J. Ward, J. Gill, H. Javadi, E. Schlecht, G. Chattopadhyay, F. Maiwald, N. R. Erickson, and I. Mehdi, A 1.7 to 1.9 THz Local Oscillator Source, IEEE Microwave and Wireless Components Letters, vol. 14, no. 6, pp 253-255, June 2004.

• J. Ward, E. Schlecht, G. Chattopadhyay, A. Maestrini, J. Gill, F. Maiwald, H. Javadi, and I. Mehdi, Capability of THz Sources Based on Schottky Diode Frequency Multiplier Chain, Proceedings, IEEE MTT-S International Microwave Symposium, Fort Worth, TX, pp. 1587-1590, June 2004.

• Alain Maestrini, John Ward, John Gill, Hamid Javadi, David Pukala, Frank Maiwald, and Imran Mehdi, Design and Performance of Planar Schottky Diode Triplers for Radio Astronomy, IEEE Mediterranean Microwave Symposium, Marseille, France, June 2004.

• John Ward, Goutam Chattopadhyay, Alain Maestrini, Erich Schlecht, John Gill, Hamid Javadi, David Pukala, Frank Maiwald, and Imran Mehdi, Tunable All-Solid-State Local Oscillators to 1900 GHz, Proceedings, Fifteenth International Symposium on Space Terahertz Technology, Amherst, Massachusetts, 2004.

• Frank Maiwald, Erich Schlecht, Robert Lin, John Ward, John Pearson, Peter Siegel, and Imran Mehdi, Reliability of cascaded THz frequency chains with planar GaAs circuits, Proceedings, Fifteenth International Symposium on Space Terahertz Technology, Amherst, Massachusetts, 2004.

• J. C. Pearson, I. Mehdi, J. S. Ward, F. W. Maiwald, R. R. Ferber, H. G. Leduc, E. T. Schlecht, J. J. Gill, W. A. Hatch, J. H. Kawamura, J. A. Stern, T. C. Gaier, L. A. Samoska, S. Weinreb, B. Bumble, D. M. Pukala, H. H. Javadi, B. P. Finamore, R. H. Lin, R. J. Dengler, J. R. Velebir, E. M. Luong, R. Tsang, A. Peralta, M. Wells, W. Chun, J. Zmuidzinas, A. Karpov, T. G. Phillips, D. Miller, A. E. Maestrini, N. Erickson, G. Swift, K. T. Liao, and M. Paquette, "THz instrumentation for the Herschel Space Observatory's Heterodyne Instrument for Far Infrared," Proceedings SPIE, Astronomical Telescopes and Instrumentation, Glasgow, Scotland, June 2004.

• F. Maiwald, J. C. Pearson, J. S. Ward, E. Schlecht, G. Chattopadhyay, J. Gill, R. Ferber, R. Tsang, R. Lin, A. Peralta, B. Finamore, W. Chun, J.J. Baker, R.J. Dengler, H. Javadi, P. Siegel and I. Mehdi, "All-Solid-State Terahertz Sources for Space Applications," Proceedings of The Joint 29th International Conference on Infrared and Millimeter Waves and the 12th International Conference on Terahertz Electronics, Karlsruhe, Germany, September 2004.

• Goutam Chattopadhyay, Imran Mehdi, John S. Ward, Erich Schlecht, Anders Skalare, and Peter H. Siegel, Development of multi-pixel heterodyne array instruments at submillimeter wavelengths, Proceedings, Asia Pacific Microwave Conference, New Delhi, India, December 2004.

• Alain Maestrini, John S. Ward, John J. Gill, Hamid H. S. Javadi, Erich Schlecht, Charlotte Tripon-Canseliet, Goutam Chattopadhyay, and Imran Mehdi, A 540-640 GHz High Efficiency Four Anode Frequency Tripler, IEEE Transactions on Microwave Theory and Techniques, vol. 53, no. 9, pp. 2835-2843, September 2005.

• Alain Maestrini, Charlotte Tripon-Canseliet, John S. Ward, John J. Gill, Hamid H. S. Javadi, Erich Schlecht, Goutam Chattopadhyay, and Imran Mehdi, Multiple-Anode Broadband Frequency Triplers at Submillimeter Wavelengths, Proceedings, Sixteenth International Symposium on Space Terahertz Technology, Göteborg, Sweden, May 2005.

• John Ward, Erich Schlecht, Goutam Chattopadhyay, Hamid Javadi, John Gill, and Imran Mehdi, Local Oscillators from 1.4 to 1.9 THz, Proceedings, Sixteenth International Symposium on Space Terahertz Technology, Göteborg, Sweden, May 2005.

• Alain Maestrini, John S. Ward, Hamid Javadi, Charlotte Tripon-Canseliet, John Gill, Goutam Chattopadhyay, Erich Schlecht, and Imran Mehdi, Local Oscillator Chain for 1.55 to 1.75 THz with 100 µW Peak Power, Microwave and Wireless Components Letters, Volume 15, Issue 12, Pages 871 - 873, December 2005.

• John Ward, "New Standards for Submillimeter Waveguides," Proceedings, Seventeenth International Symposium on Space Terahertz Technology, Paris, France, May 2006.

• Alain Maestrini, Charlotte Tripon-Canseliet, John S. Ward, John J. Gill, and Imran Mehdi, "A High Efficiency Multiple-Anode 260-340 GHz Frequency Tripler," Proceedings, Seventeenth International Symposium on Space Terahertz Technology, Paris, France, May 2006.

• Goutam Chattopadhyay, John S. Ward, Imran Mehdi, and Peter H. Siegel, "TIP: A Terahertz Interferometer for Planets - A Concept Study," Proceedings, Seventeenth International Symposium on Space Terahertz Technology, Paris, France, May 2006.

• A.J. Skalare, G. Chattopadhyay, I. Mehdi, J.S. Ward, E.T. Schlecht, and P.H. Siegel, "Heterodyne Array Instruments for Submillimeter Wavelengths," Proceedings SPIE, Astronomical Telescopes and Instrumentation, Orlando, Florida, May 2006.

• I. Mehdi, G. Chattopadhyay, E. Schlecht, J. Ward, J. Gill, F. Maiwald, and A. Maestrini, "Terahertz Multiplier Circuits," 2006 IEEE MTT-S International Microwave Symposium Digest, San Francisco, California, June 2006.

• A. Maestrini, Charlotte Tripon-Canseliet, John Ward, John J. Gill, Erich Schlecht, Goutam Chattopadhyay, Imran Mehdi, Gérard Beaudin, and Bertrand Thomas, "Schottky Diodes for Frequency Multipliers and Mixers," invited presentation, 3rd International Symposium on Ultra-Fast Phenomena & Terahertz Waves, Purple Mountain Observatory, Nanjing, China, September 25-27, 2006.

• G. Chattopadhyay, J. Ward, I. Mehdi, and P. Siegel, "Terahertz Sources, Sensors, and Components - Performance and Capabilities," Proceedings SPIE, Optics East, vol. 6373, Boston, Massachusetts, October 2006.

• A. Maestrini, Charlotte Tripon-Canseliet, John S. Ward, John J. Gill, Erich Schlecht, Goutam Chattopadhyay and Imran Mehdi, "A 780-950 GHz frequency tripler for radio astronomy," Proceedings of the 18th International Symposium on Space Terahertz Technology, Pasadena, USA, March 21-23, 2007.

• P. C. Stek, G. Chattopadhyay, R. Coefield, R. Jarnot, J. Kawamura, K. Lee, N. Livesey, and J. Ward, "System Design and Technology Development for an Azimuth Scanning Microwave Limb Sounder," Proceedings of the AGU Fall Meeting, San Francisco, CA, December 2007.

• J. S. Ward, K. A. Lee, J. Kawamura, G. Chattopadhyay, and P. C. Stek, "Sensitive Broadband Receivers for Microwave Limb Sounding," Proceedings of the AGU Fall Meeting, San Francisco, CA, December 2007.

• Alain Maestrini, John S. Ward, Charlotte Tripon-Canseliet, John J. Gill, Choonsup Lee, Hamid Javadi, Goutam Chattopadhyay, and Imran Mehdi, "In-Phase Power-Combined Frequency Triplers at 300 GHz," IEEE Microwave and Wireless Components Letters, March 2008.

• Imran Mehdi, John Ward, Alain Maestrini, Goutam Chattopadhyay, Erich Schlecht and John Gill, "Pushing the Limits of Multiplier-Based Local Oscillator Chains," Proceedings of the Ninteenth International Symposium on Space Terahertz Technology, Groningen, Netherlands, April 2008.

• G. Chattopadhyay, J. Ward, and H. Manohara, "Silicon Micromachined Components at Terahertz Frequencies for Astrophysics and Planetary Applications," Proceedings of the Ninteenth International Symposium on Space Terahertz Technology, Groningen, Netherlands, April 2008.

• A. Maestrini, J. Ward, G. Chattopadhyay, E. Schlecht, and I. Mehdi, "Terahertz Sources Based on Frequency Multiplication and Their Applications," invited paper, Frequenz, Journal of RF-Engineering and Telecommunications, ISSN 0016-1136, Issue 5/6 2008.

• John S. Ward, Karen Lee, Jonathan Kawamura, Goutam Chattopadhyay, and Paul Stek, "Sensitive Broadband Receivers for Microwave Limb Sounding," Proceedings, Eighth Annual NASA Earth Science Technology Conference, Adelphi, Maryland, June 2008.

• Alain Maestrini, John Ward, Goutam Chattopadhyay, Erich Schlecht, John Gill, Choonsup Lee, Hamid Javadi, and Imran Mehdi, "In-Phase Power Combining of Submillimeter-Wave Multipliers," Proceedings, 33rd International Conference on Infrared, Millimeter, and Terahertz Waves, Pasadena, California, September 2008.

• Goutam Chattopadhyay, John Ward, and Harish Manohara, "Deep Reactive Ion Etching Based Silicon Micromachined Components at Terahertz Frequencies for Space Applications," Proceedings, 33rd International Conference on Infrared, Millimeter, and Terahertz Waves, Pasadena, California, September 2008.

• John S. Ward, Karen A. Lee, Jonathan Kawamura, Goutam Chattopadhyay, and Paul Stek, "Sensitive Broadband Receivers for Microwave Limb Sounding," Proceedings, 33rd International Conference on Infrared, Millimeter, and Terahertz Waves, Pasadena, California, September 2008.

• Peter J. Bruneau, Hal D. Janzen, and John S. Ward, "Machining of Terahertz Split-Block Waveguides with Micrometer Precision," Proceedings, 33rd International Conference on Infrared, Millimeter, and Terahertz Waves, Pasadena, California, September 2008.

• John S. Ward, Goutam Chattopadhyay, John Gill, Hamid Javadi, Choonsup Lee, Robert Lin, Alain Maestrini, Frank Maiwald, Imran Mehdi, Erich Schlecht, and Peter Siegel "Tunable Broadband Frequency-Multiplied Terahertz Sources," Invited Keynote, Proceedings, 33rd International Conference on Infrared, Millimeter, and Terahertz Waves, Pasadena, California, September 2008.