The performance of the detector arrays generally defines the ultimate performance of the instrument. Implicit in this expectation is the necessary sensitivity of the specific detector technology selected for a given mission. This sensitivity is generally determined by the quantum efficiency and the noise characteristics of the detector under its operating conditions. However, in selecting a detector many more variables need to be considered such as: the costs associated with a particular IR technology, the array format availability, operating conditions, reliability, level of manufacturing complexity, technical support, reliability, replaceability and compatibility with interfacing technologies (readout ICs, frame rates etc.). Strained Layer Superlattice (SLS) detectors are a new class of detectors. These detectors may be the next generation of band-gap engineered, large format infrared detector arrays with substantially higher quantum efficiencies than existing quantum well-based (QWIPs) detectors and provide a competitive alternative to the current state-of-the-art mercury cadmium telluride detector arrays. In our Phase I IRAD project we verified that the quantum efficiency exceeded 50%. To adequately determine the suitability of any detector array for an instrument requires evaluation in a much more relevant environment (clearly stated, and for good reason, in the TRL definitions). To accomplish this next level of verification we need to develop a fully operational camera system using an SLS array. If they prove to perform well in an operational environment they will be of extraordinary value to future NASA Earth science and astronomical missions. The US Dept. of Defense is also pursuing the development and maturation of this technology as well as government and industry of foreign countries (from France to India). The industrial applications for this technology are currently being filled by Quantum Well IR detectors, microbolometers, InSb and MCT devices. However, SLS can be easily migrated into these same applications once the technology is mature enough.
More »Organizations Performing Work | Role | Type | Location |
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Goddard Space Flight Center (GSFC) | Lead Organization | NASA Center | Greenbelt, Maryland |
QmagiQ | Supporting Organization | Industry | Nashua, New Hampshire |