Mr. George Che Profile

George Che

Graduate Research Associate at Arizona State Univ

SPIE Involvement:

Author | Science Fair Judge

Publications (8)

Proceedings Article | 10 July 2018 Presentation

SuperSpec: the on-chip spectrometer: characterization of a full 300 channel filterbank (Conference Presentation)

Jordan Wheeler, Steve Hailey-Dunsheath, Erik Shirokoff, Peter Barry, Charles Bradford, Scott Chapman, George Che, Simon Doyle, Jason Glenn, Sam Gordon, Matthew Hollister, Atilla Kovacs, Henry Leduc, Philip Mauskopf, Ryan McGeehan, Christopher McKenney, Theodore Reck, Joeseph Redford, Colin Ross, Corwin Shiu, Carole Tucker, Jordan Turner, Jonas Zmuidzinas

Proceedings Volume 10708, 107080P (2018) https://doi.org/10.1117/12.2314364

KEYWORDS: Spectroscopy, Optical filters, Sensors, Spectroscopes, Resonators, Astronomical imaging, Tin, Galactic astronomy, Spectroscopic atmospheric monitoring techniques

Read Abstract +

SuperSpec is a new technology for millimeter and submillimeter spectroscopy. It is an on-chip spectrometer being developed for multi-object, moderate resolution (R = ~300), large bandwidth survey spectroscopy of high-redshift galaxies for the 1 mm atmospheric window. SuperSpec targets the CO ladder in the redshift range of z = 0 to 4, the [CII] 158 um line from z = 5 to 9, and the [NII] 205 um line from z = 4-7. All together these lines offer complete redshift coverage from z = 0 to 9. SuperSpec employs a novel architecture in which detectors are coupled to a series of resonant filters along a single microwave feedline instead of using dispersive optics. This construction allows for the creation of a full spectrometer occupying only 20 cm squared of silicon, a reduction in size of several orders of magnitude when compared to standard grating spectrometers. This small profile enables the production of future multi-object spectroscopic instruments required as the millimeter-wave spectroscopy field matures. SuperSpec uses a lens-coupled antenna to deliver astrophysical radiation to a microstrip transmission line. The radiation then propagates down this transmission line where upon proximity coupled half wavelength microstrip resonators pick off specific frequencies of radiation. Careful tuning of the proximity of the resonators to the feedline dials in the desired resolving power of the SuperSpec filterbank by tuning the coupling quality factor. The half wavelength resonators are then in turn coupled to the inductive meander of kinetic inductance detectors (KIDs), which serve as the power detectors for the SuperSpec filterbank. Each SuperSpec filter bank contains hundreds of titanium nitride TiN KIDs and the natural multiplexibility of these detectors allow for readout of the large numbers of required detectors. The unique coupling scheme employed by SuperSpec allows for the creation of incredibly low volume (2.6 cubic microns), high responsivity, TiN KIDs. Since responsivity is proportional to the inverse of quasiparticle-occupied volume, this allows SuperSpec to reach the low NEPs required by moderate resolution spectroscopy to be photon limited from the best ground-based observing sites. We will present the latest results from SuperSpec devices. In particular, detector NEPs, measured filter bank efficiency (including transmission line losses), and spectral profiles for a full ~ 300-channel filterbank. Finally, we will report on our system end to end efficiency and total system NEP.

Proceedings Article | 10 July 2018 Presentation

On-sky demonstration of the SuperSpec millimeter-wave spectrometer (Conference Presentation)

Kirit Karkare, Peter Barry, C. Matt Bradford, Scott Chapman, George Che, Jason Glenn, Sam Gordon, Steven Hailey-Dunsheath, Matthew Hollister, Attila Kovacs, Henry Leduc, Philip Mauskopf, Ryan McGeehan, Chris McKenney, Theodore Reck, Joseph Redford, Erik Shirokoff, Carole Tucker, Jordan Turner, Samantha Walker, Jordan Wheeler, Jonas Zmuidzinas

Proceedings Volume 10708, 107081R (2018) https://doi.org/10.1117/12.2313786

KEYWORDS: Spectroscopy, Telescopes, Galactic astronomy, Optical filters, Spectrometer engineering, Spectroscopes, Tin, Inductance, Sensors, Control systems

Read Abstract +

Proceedings Article | 9 July 2018 Presentation + Paper

The design and characterization of a 300 channel, optimized full-band millimeter filterbank for science with SuperSpec

J. Redford, J. Wheeler, K. Karkare, S. Hailey-Dunsheath, C. Bradford, E. Shirokoff, P. Barry, G. Che, J. Glenn, H. Leduc, P. Mauskopf, R. McGeehan, T. Reck, J. Zmuidzinas

Proceedings Volume 10708, 107081O (2018) https://doi.org/10.1117/12.2313666

KEYWORDS: Resonators, Optical filters, Sensors, Mirrors, Spectroscopy, Galactic astronomy, Telescopes, Antennas, Niobium, Capacitors

Read Abstract +

Proceedings Article | 27 July 2016 Paper

SuperSpec: development towards a full-scale filter bank

J. Wheeler, S. Hailey-Dunsheath, E. Shirokoff, P. Barry, C. Bradford, S. Chapman, G. Che, J. Glenn, M. Hollister, A. Kovács, H. LeDuc, P. Mauskopf, R. McGeehan, C. McKenney, R. O’Brient, S. Padin, T. Reck, C. Ross, C. Shiu, C. Tucker, R. Williamson, J. Zmuidzinas

Proceedings Volume 9914, 99143K (2016) https://doi.org/10.1117/12.2233798

KEYWORDS: Sensors, Spectroscopy, Spectroscopes, Galactic astronomy, Optical filters, Prototyping, Sensors, Spectroscopy, Optical filters, Technetium, Resonators, Tomography, Ultraviolet radiation

Read Abstract +

Proceedings Article | 19 July 2016 Paper

Instrumental performance and results from testing of the BLAST-TNG receiver, submillimeter optics, and MKID detector arrays

Nicholas Galitzki, Peter Ade, Francesco Angilè, Peter Ashton, Jason Austermann, Tashalee Billings, George Che, Hsiao-Mei Cho, Kristina Davis, Mark Devlin, Simon Dicker, Bradley Dober, Laura Fissel, Yasuo Fukui, Jiansong Gao, Samuel Gordon, Christopher Groppi, Seth Hillbrand, Gene Hilton, Johannes Hubmayr, Kent Irwin, Jeffrey Klein, Dale Li, Zhi-Yun Li, Nathan Lourie, Ian Lowe, Hamdi Mani, Peter Martin, Philip Mauskopf, Christopher McKenney, Federico Nati, Giles Novak, Enzo Pascale, Giampaolo Pisano, Fabio Santos, Douglas Scott, Adrian Sinclair, Juan Soler, Carole Tucker, Matthew Underhill, Michael Vissers, Paul Williams

Proceedings Volume 9914, 99140J (2016) https://doi.org/10.1117/12.2231167

KEYWORDS: Polarization, Polarimetry, Clouds, Stars, Sensors, Magnetism, Electroluminescent displays, Mirrors, Cryogenics, Helium

Read Abstract +

Proceedings Article | 19 July 2016 Paper

Development of dual-polarization LEKIDs for CMB observations

Heather McCarrick, Maximilian Abitbol, Peter A. Ade, Peter Barry, Sean Bryan, George Che, Peter Day, Simon Doyle, Daniel Flanigan, Bradley Johnson, Glenn Jones, Henry LeDuc, Michele Limon, Philip Mauskopf, Amber Miller, Carole Tucker, Jonas Zmuidzinas

Proceedings Volume 9914, 99140O (2016) https://doi.org/10.1117/12.2231830

KEYWORDS: Inductance, Microwave radiation, Silicon, Semiconducting wafers, Sensors, Sensors, Polarization, Resonators, Waveguides, Black bodies, Absorption

Read Abstract +

Proceedings Article | 19 August 2014 Paper

A LEKID-based CMB instrument design for large-scale observations in Greenland

D. Araujo, P. A. Ade, J. Bond, K. Bradford, D. Chapman, G. Che, P. Day, J. Didier, S. Doyle, H. Eriksen, D. Flanigan, C. Groppi, Seth Hillbrand, B. Johnson, G. Jones, Michele Limon, A. Miller, P. Mauskopf, H. McCarrick, T. Mroczkowski, B. Reichborn-Kjennerud, B. Smiley, Joshua Sobrin, I. Wehus, J. Zmuidzinas

Proceedings Volume 9153, 91530W (2014) https://doi.org/10.1117/12.2056828

KEYWORDS: Sensors, Polarization, Telescopes, Calibration, Polarimetry, Photons, Modulation, Detector arrays, Optical components, Semiconducting wafers

Read Abstract +

Proceedings Article | 23 July 2014 Paper

The next-generation BLASTPol experiment

Bradley Dober, Peter A. Ade, Peter Ashton, Francesco Angilè, James Beall, Dan Becker, Kristi Bradford, George Che, Hsiao-Mei Cho, Mark Devlin, Laura Fissel, Yasuo Fukui, Nicholas Galitzki, Jiansong Gao, Christopher Groppi, Seth Hillbrand, Gene Hilton, Johannes Hubmayr, Kent Irwin, Jeffrey Klein, Jeff Van Lanen, Dale Li, Zhi-Yun Li, Nathan Lourie, Hamdi Mani, Peter Martin, Philip Mauskopf, Fumitaka Nakamura, Giles Novak, David Pappas, Enzo Pascale, Fabio Santos, Giorgio Savini, Douglas Scott, Sara Stanchfield, Joel Ullom, Matthew Underhill, Michael Vissers, Derek Ward-Thompson

Proceedings Volume 9153, 91530H (2014) https://doi.org/10.1117/12.2054419

KEYWORDS: Sensors, Electroluminescent displays, Polarization, Magnetism, Mirrors, Stars, Clouds, Physics, Astronomy, Staring arrays

Read Abstract +

Showing 5 of 8 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years