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New and better near-infrared detectors for jwst near infrared spectrograph
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Wen, Yiting Rauscher, Bernard J. Linder, Don Hill, Robert J. Greenhouse, Matthew A. Mott, D. Brent |
| Copyright Year | 2014 |
| Description | ESA and NASA recently selected two 5 m cutoff Teledyne H2RG sensor chip assemblies (SCA) for flight on the James Webb Space Telescope (JWST) Near Infrared Spectrograph (NIRSpec). These HgCdTe SCAs incorporate Teledynes improved barrier layer design that eliminates the degradation that affected earlier JWST H2RGs(Rauscher et al. 2012a). The better indium barrier, together with other design changes, has improved the performance and reliability of JWSTs SCAs. In this article, we describe the measured performance characteristics that most directly affect scientific observations including read noise, total noise, dark current, quantum efficiency (QE), and image persistence. As part of measuring QE, we measured the quantum yield as a function of photon energy,, and found that it exceeds unity for photon energies E (2.65.2) Eg, where Eg is the HgCdTe bandgap energy. This corresponds to. 2 m for NIRSpecs 5 m cutoff HgCdTe. Our measurements agree well with a previous measurement by McCullough et al. (2008) for. 1.3. For 1.3, we find a slower increase in with photon energy than McCullough et al. did. However, and as McCullough et al. note, their two state model of the yield process is not valid for large 1. |
| File Size | 431356 |
| Page Count | 19 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140008961 |
| Archival Resource Key | ark:/13960/t6353nj08 |
| Language | English |
| Publisher Date | 2014-03-24 |
| Access Restriction | Open |
| Subject Keyword | New and Better Near-infrared Detectors Near Infrared Radiation Mercury Cadmium Tellurides James Webb Space Telescope Quantum Efficiency Spectrographs Dark Current Photons Energy Gaps Solid State Indium Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
