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We propose to develop advanced antenna pattern prediction software using fast algorithm for integral equation. The software will be developed from first principle integral equation solver accelerated by the multi-level fast multipole algorithm. Material effects will be included using volume integral equation and a newly developed thin dielectric sheet model. The model entails full physics, a ...

We intend to use our recently developed IRT model for scoring multidimensional pairwise preference items as the basis for a computerized adaptive test (CAT) that is designed to be fake resistant. The items will consist primarily of pairs of personality statements, on different dimensions, which are similar in social desiriability. A respondent's task will be to choose the statement in each pair ...

It is critical in the field on infrared imaging to reduce array costs and simultaneously improve their performance. We propose to achieve both. The use of long wavelength infrared HgCdTe grown on Si substrates will reduce the array costs, increase its mechanical strength and permit the fabrication of larger area arrays than present-day technology based on bulk CdZnTe substrates. Performance enhanc ...

High sensitivity HgCdTe infrared arrays operating at 77K can now be tailored in a wide range of wavelengths. However, the cooling requirements make them bulky and unsuitable for many DOD applications. We propose two novel approaches to increase their operating temperature. In the first approach, we will demonstrate p-d-n equilibrium HgCdTe detectors. Because of the lack of symmetry between the va ...

The use of Si-based composite substrates for HgCdTe infrared focal plane arrays holds the promise of improved resolution, greater robustness and lower cost as compared to arrays that employ the present-day standard CdZnTe substrates. The principal challenge associated with the use of Si-based substrates is the presence of dislocations, created by the large lattice mismatch, that thread into the Hg ...

Modern Air Force weapon systems need to detect, recognize and track a variety of targets under a wide spectrum of atmospheric conditions. Recent technology developments are paving the way toward imaging optical radars with wavelengths in MWIR range for these applications. The best suited detectors for optical radars are the avalanche photodiodes (APDs) due to their high gain-bandwidth characterist ...

The problem to be solved in the proposed work is that the deposition of the usual In and Au metal contacts on HgCdTe-based IR detectors creates additional stress in the HgCdTe immediately below the contacts, This stress has been observed to getter threading dislocations, which, in turn, creates misfit dislocation segments just below the detector surface and parallel to the surface, in the active a ...

The most challenging degrading effect on current state-of-the-art focal plane arrays is caused by the random spatial and temporal photoresponse nonuniformity of the pixels. We propose a major improvement by controlling the temperature of individual pixels with individual thermoelectric coolers. We will use HgxCd1-xTe/HgyCd1-yTe superlattices (SLs) as the thermoelectric material. Two major benefits ...

In this work, we will demonstrate military specification compatible 1.8 - 1.85 µm InP-based diode pump laser arrays with a power output exceeding 10 W, the critical milestone necessary to enabling system insertion. These sources can help in the critical development of a variety of military and home security applications, including optical pumping sources for 3-5 µm lasers, chemical sensing, las ...

We will demonstrate novel, Si-based technology for ultra-lightweight, high-efficiency, triple junction solar cells. Next-generation satellites require increased payload mass and power budget capabilities. Ultra lightweight, 40% efficient solar cells employing Silicon substrates will reduce array size and solar cell payload mass while still enabling power level scale-up. Our advanced, next gener ...