Prof. Ghassan Yassin Profile

Prof. Ghassan Yassin

Professor in Physics at Univ of Oxford

SPIE Involvement:

Author

Publications (18)

Proceedings Article | 31 August 2022 Poster + Paper

Electromagnetic performance comparisons of 0.85 THz integrated bias-tee SIS mixers with twin-junction and end-loaded tuning schemes

Boon-Kok Tan, Kirill Rudakov, Valery Koshelets, Andrey Khudchenko, Andrey Baryshev, Ghassan Yassin

Proceedings Volume 12190, 1219020 (2022) https://doi.org/10.1117/12.2628733

KEYWORDS: Terahertz radiation, Waveguides, Tolerancing, Electromagnetism, Antennas, Niobium, Astronomy, Transformers, Superconductors, Quartz

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Proceedings Article | 29 August 2022 Presentation

The far-infrared spectroscopic surveyor: probing role of the interstellar medium in star formation and galaxy evolution

Dimitra Rigopoulou, Boon Tan, Brian Ellison, Chris Pearson, Susanne Aalto, Emmanuel Caux, Ismael Garcia-Bernete, Maryvonne Gerin, Javier Goicoechea, Paul Goldsmith, Leslie Hunt, Carsten Kramer, Dariusz Lis, Georgios Magdis, Sergio Molinari, Volker Ossenkopf-Okada, Giorgio Savini, Serena Viti, Martina Wiedner, Ghassan Yassin

Proceedings Volume 12180, 121802G (2022) https://doi.org/10.1117/12.2630319

KEYWORDS: Terahertz radiation, Spectroscopy, Galactic astronomy, Stars, Galaxy evolution, Heterodyning, Far infrared, Target detection, Superconductors, Process control

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Proceedings Article | 29 July 2016 Paper

The Far Infrared Spectroscopic Explorer (FIRSPEX): probing the lifecycle of the ISM in the universe

D. Rigopoulou, M. Caldwell, B. Ellison, C. Pearson, E. Caux, A. Cooray, J. Gallego, M. Gerin, J. Goicoechea, P. Goldsmith, C. Kramer, D. Lis, S. Molinari, V. Ossenkopf-Okada, G. Savini, B. Tan, X. Tielens, S. Viti, M. Wiedner, G. Yassin

Proceedings Volume 9904, 99042K (2016) https://doi.org/10.1117/12.2233593

KEYWORDS: Terahertz radiation, Galactic astronomy, Spectroscopy, Far infrared, Receivers, Clouds, Stars, Spectroscopy, Astronomy, Spectral resolution, Physics

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Proceedings Article | 23 July 2014 Paper

Local oscillator development for focal plane array and supra-THz astronomy receivers

Manju Henry, Brian Ellison, Pawala Aryathilaka, Nick Brewster, Peter Huggard, Ghassan Yassin, Stafford Withington, Doris Maier

Proceedings Volume 9153, 91530O (2014) https://doi.org/10.1117/12.2056792

KEYWORDS: Diodes, Receivers, Terahertz radiation, Waveguides, Oscillators, Astronomy, Quartz, Staring arrays, Aluminum nitride, Photography

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Proceedings Article | 23 July 2014 Paper

A single-chip dual-band switched SIS mixer

Boon Kok Tan, Ghassan Yassin, Stafford Withington

Proceedings Volume 9153, 91532O (2014) https://doi.org/10.1117/12.2058771

KEYWORDS: Superconductors, Switches, Receivers, Terahertz radiation, Waveguides, Antennas, Capacitance, Heterodyning, Switching, Circuit switching

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Proceedings Article | 23 July 2014 Paper

Instrumentation for single-dish observations with The Greenland Telescope

Paul Grimes, K. Asada, R. Blundell, R. Burgos, H-H. Chang, M. Chen, D. Goldie, C. Groppi, C. Han, P. T. Ho, Y. Huang, M. Inoue, D. Kubo, P. Koch, J. Leech, E. de Lera Acedo, P. Martin-Cocher, H. Nishioka, M. Nakamura, S. Matsushita, S. Paine, N. Patel, P. Raffin, W. Snow, T. Sridharan, R. Srinivasan, C. Thomas, E. Tong, M.-J. Wang, C. Wheeler, S. Withington, G. Yassin, L.-Z. Zeng

Proceedings Volume 9153, 91531V (2014) https://doi.org/10.1117/12.2056969

KEYWORDS: Antennas, Telescopes, Terahertz radiation, Prototyping, Galactic astronomy, Astronomy, Heterodyning, Receivers, Field programmable gate arrays, Observatories

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The Greenland Telescope project will deploy and operate a 12m sub-millimeter telescope at the highest point of the Greenland i e sheet. The Greenland Telescope project is a joint venture between the Smithsonian As- trophysical Observatory (SAO) and the Academia Sinica Institute of Astronomy and Astrophysics (ASIAA). In this paper we discuss the concepts, specifications, and science goals of the instruments being developed for single-dish observations with the Greenland Telescope, and the coupling optics required to couple both them and the mm-VLBI receivers to antenna. The project will outfit the ALMA North America prototype antenna for Arctic operations and deploy it to Summit Station,1 a NSF operated Arctic station at 3,100m above MSL on the Greenland I e Sheet. This site is exceptionally dry, and promises to be an excellent site for sub-millimeter astronomical observations. The main science goal of the Greenland Telescope is to carry out millimeter VLBI observations alongside other telescopes in Europe and the Americas, with the aim of resolving the event horizon of the super-massive black hole at the enter of M87. The Greenland Telescope will also be outfitted for single-dish observations from the millimeter-wave to Tera-hertz bands. In this paper we will discuss the proposed instruments that are currently in development for the Greenland Telescope - 350 GHz and 650 GHz heterodyne array receivers; 1.4 THz HEB array receivers and a W-band bolometric spectrometer. SAO is leading the development of two heterodyne array instruments for the Greenland Telescope, a 48- pixel, 325-375 GHz SIS array receiver, and a 4 pixel, 1.4 THz HEB array receiver. A key science goal for these instruments is the mapping of ortho and para H2D+ in old protostellar ores, as well as general mapping of CO and other transitions in molecular louds. An 8-pixel prototype module for the 350 GHz array is currently being built for laboratory and operational testing on the Greenland Telescope. Arizona State University are developing a 650 GHz 256 pixel SIS array receiver based on the KAPPa SIS mixer array technology and ASIAA are developing 1.4 THz HEB single pixel and array receivers. The University of Cambridge and SAO are collaborating on the development of the CAMbridge Emission Line Surveyor (CAMELS), a W-band `on- hip' spectrometer instrument with a spectral resolution of R ~ 3000. CAMELS will consist of two pairs of horn antennas, feeding super conducting niobium nitride filter banks read by tantalum based Kinetic Inductance Detectors.

Proceedings Article | 15 July 2010 Paper

Finline-integrated cold electron bolometer

Ernst Otto, Mikhail Tarasov, Paul Grimes, Natalia Kaurova, Hannes Kuusisto, Leonid Kuzmin, Ghassan Yassin

Proceedings Volume 7741, 77411A (2010) https://doi.org/10.1117/12.858263

KEYWORDS: Bolometers, Fabrication, Sensors, Waveguides, Optical testing, Resistance, Photomasks, Superconductors, Temperature metrology, Metals

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Proceedings Article | 15 July 2010 Paper

A 700 GHz unilateral finline SIS mixer fed by a multi-flare angle smooth-walled horn

Boon-Kok Tan, Ghassan Yassin, Paul Grimes, Jamie Leech, Karl Jacobs, Stafford Withington, Mike Tacon, Christopher Groppi

Proceedings Volume 7741, 774110 (2010) https://doi.org/10.1117/12.856711

KEYWORDS: Waveguides, Silicon, Superconductors, Transformers, Capacitance, Double sideband modulation, Gold, Lead, Sensors, Heterodyning

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Proceedings Article | 19 July 2008 Paper

Dielectric constant reduction using porous substrates in finline millimetre and submillimetre detectors

Chris North, Michael Audley, Dorota Glowacka, David Goldie, Paul Grimes, Bradley Johnson, Bruno Maffei, Simon Melhuish, Lucio Piccirillo, Giampaolo Pisano, Vassilka Tsaneva, Stafford Withington, Ghassan Yassin

Proceedings Volume 7020, 70202G (2008) https://doi.org/10.1117/12.788479

KEYWORDS: Dielectrics, Waveguides, Sensors, Silicon, Transformers, Solids, Manufacturing, Copper, Polarimetry, Deep reactive ion etching

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Proceedings Article | 18 July 2008 Paper

The CLOVER experiment

L. Piccirillo, P. Ade, M. Audley, C. Baines, R. Battye, M. Brown, P. Calisse, A. Challinor, W. Duncan, P. Ferreira, W. Gear, D. Glowacka, D. Goldie, P. Grimes, M. Halpern, V. Haynes, G. Hilton, K. Irwin, B. Johnson, M. Jones, A. Lasenby, P. Leahy, J. Leech, S. Lewis, B. Maffei, L. Martinis, P. Mauskopf, S. Melhuish, C. North, D. O'Dea, S. Parsley, G. Pisano, C. Reintsema, G. Savini, R. Sudiwala, D. Sutton, A. Taylor, G. Teleberg, D. Titterington, V. Tsaneva, C. Tucker, R. Watson, S. Withington, G. Yassin, J. Zhang

Proceedings Volume 7020, 70201E (2008) https://doi.org/10.1117/12.788927

KEYWORDS: Sensors, Polarization, Mirrors, Polarimetry, Cryogenics, Waveguides, Physics, Staring arrays, Astronomy, Microwave radiation

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Proceedings Article | 18 July 2008 Paper

Performance of microstrip-coupled TES bolometers with finline transitions

Michael Audley, Dorota Glowacka, David Goldie, Vassilka Tsaneva, Stafford Withington, Paul Grimes, Chris North, Ghassan Yassin, Lucio Piccirillo, Peter Ade, Rashmi Sudiwala

Proceedings Volume 7020, 70200M (2008) https://doi.org/10.1117/12.789076

KEYWORDS: Sensors, Waveguides, Prototyping, Bolometers, Silicon, Multiplexers, Optical testing, Polarization, Resistors, Copper

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Proceedings Article | 6 July 2006 Paper

Characterising the electrothermal properties of microstrip-coupled TES detectors

Louisa Dunlop, Dorota Glowacka, David Goldie, Stafford Withington, Ghassan Yassin

Proceedings Volume 6275, 627507 (2006) https://doi.org/10.1117/12.671052

KEYWORDS: Resistance, Sensors, Superconductors, Resistors, Astronomy, Silicon, Electroluminescence, Phonons, Waveguides, Deep reactive ion etching

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Proceedings Article | 27 June 2006 Paper

Investigation of planar switches for large format CMB polarization instruments

Paul Grimes, Ghassan Yassin, Leonid Kuzmin, Phillip Mauskopf, Ernst Otto, Michael Jones, Chris North

Proceedings Volume 6275, 627525 (2006) https://doi.org/10.1117/12.671151

KEYWORDS: Switches, Superconductors, Microelectromechanical systems, Phase shifts, Circuit switching, Niobium, Inductance, Waveguides, Polarization, Bridges

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Proceedings Article | 16 June 2006 Paper

TES imaging array technology for C_ℓOVER

Michael Audley, Robert Barker, Michael Crane, Roger Dace, Dorota Glowacka, David Goldie, Anthony Lasenby, Howard Stevenson, Vassilka Tsaneva, Stafford Withington, Paul Grimes, Bradley Johnson, Ghassan Yassin, Lucio Piccirillo, Giampaolo Pisano, William Duncan, Gene Hilton, Kent Irwin, Carl Reintsema, Mark Halpern

Proceedings Volume 6275, 627524 (2006) https://doi.org/10.1117/12.670792

KEYWORDS: Sensors, Telescopes, Multiplexers, Polarimetry, Waveguides, Polarization, Bolometers, Prototyping, Copper, Multiplexing

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Proceedings Article | 8 October 2004 Paper

Quantum multitone simulations of saturation in SIS mixers

Paul Grimes, Stafford Withington, Ghassan Yassin, Phichet Kittara

Proceedings Volume 5498, (2004) https://doi.org/10.1117/12.549781

KEYWORDS: Receivers, Interference (communication), Device simulation, Resistance, Calibration, Capacitance, Astronomy, Temperature metrology, Quantum physics, Modulation

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