The QWIP focal plane assembly for NASA's Landsat Data Continuity Mission

Jhabvala, M.; Reuter, Dennis C.; Choi, K. K.; Sundaram, M.; Jhabvala, Christine A.; La, A.; Waczynski, Augustyn; Bundas, Jason

doi:10.1117/12.849305

Cited by 14 publications

(14 citation statements)

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“…The value of g can be improved by adopting higher doping density, thicker detector material, and possibly AR-coating. Nevertheless, the present g is within the same range as that observed in some commercial QWIP FPAs, and the calculated lineshape is in agreement with a grating-QWIP coupled to a broadband detector material [2] and explains the narrow 8-9 lm lineshape of typical QWIP FPAs with 25 lm pixel pitch. The agreements obtained in the PR-QWIP and the grating-QWIP cases thus lend experimental support to the present EM field simulation.…”

Section: C-qwips With Thin Substratesupporting

confidence: 84%

“…In this section, we apply the classical geometric-optical (GO) C-QWIP model [1] to one of the FPAs developed for a thermal infrared sensor (TIRS) instrument [2]. To predict the external quantum efficiency g of a C-QWIP FPA, the absorption coefficient a(k) of the QWIP material is first calculated for parallel propagating light with a proper polarization.…”

Section: Tirs5 Fpamentioning

confidence: 99%

See 1 more Smart Citation

C-QWIPs for space exploration

Choi

Jhabvala

Forrai

et al. 2011

Infrared Physics & Technology

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Section: C-qwips With Thin Substratesupporting

confidence: 84%

Section: Tirs5 Fpamentioning

confidence: 99%

C-QWIPs for space exploration

Choi

Jhabvala

Forrai

et al. 2011

Infrared Physics & Technology

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“…All three entities worked on modelling and defining the superlattice growth recipe. The thickness of the gallium arsenide (GaAs) quantum wells and the aluminum gallium arsenide (AlGaAs) barrier layers and the concentration of aluminum in the AlGaAs primarily determine the band structure in the wells and, hence, the spectral response of the detector material [13,14]. This design was provided to a fabrication house, which deposited 20 alternating layers of GaAs quantum wells and AlGaAs barriers using molecular beam epitaxy (MBE).…”

Section: Focal Planementioning

confidence: 99%

The Thermal Infrared Sensor (TIRS) on Landsat 8: Design Overview and Pre-Launch Characterization

Reuter

Richardson²,

Pellerano³

et al. 2015

Remote Sensing

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The Thermal Infrared Sensor (TIRS) on Landsat 8 is the latest thermal sensor in that series of missions. Unlike the previous single-channel sensors, TIRS uses two channels to cover the 10–12.5 micron band. It is also a pushbroom imager; a departure from the previous whiskbroom approach. Nevertheless, the instrument requirements are defined such that data continuity is maintained. This paper describes the design of the TIRS instrument, the results of pre-launch calibration measurements and shows an example of initial on-orbit science performance compared to Landsat 7.

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“…The values of f n are obtained after solving the eigen energies and eigen functions of the structure. The C-QWIP pixel geometry reflects the normally incident light into parallel propagation, with which η is given by ( (2) In Eqn. (2), t s is the substrate transmission, f p is the pixel fill factor, η int is the internal quantum efficiency, κ is a factor proportional to the thickness of the active layer inside a corrugation, p is the pixel linear dimension, t is the corrugation height, and γ(V) is the transmission coefficient of a photoelectron traveling out of the quantum well at a bias V. The resulting photocurrent J p generated within a C-QWIP pixel will then be…”

Section: Tirs5 Fpamentioning

confidence: 99%

“…In this section, we will apply the existing C-QWIP model [1] to one of the FPAs developed for TIRS instrument [2]. To predict the external quantum efficiency η of a C-QWIP FPA, the absorption coefficient α(λ) of the QWIP material is first calculated for parallel propagating light with a proper polarization.…”

Section: Tirs5 Fpamentioning

confidence: 99%

C-QWIPs for far infrared detection

Choi

Jhabvala

Forrai³

et al. 2010

SPIE Proceedings

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We have extended our investigation of corrugated quantum well infrared photodetector focal plane arrays (C-QWIP FPAs) into the far infrared regime. Specifically, we are developing the detectors for the Thermal Infrared Sensor (TIRS) used in the Landsat Data Continuity Mission. This mission requires infrared detection cutoff at 12.5 μm and FPAs operated at 43 K. To maintain a low dark current in these extended wavelengths, we adopted a low doping density of 0.6 × 10 18 cm -3 and a bound-to-bound state detector in one of the designs. The internal absorption QE is calculated to be 25.4% for a pixel pitch of 25 microns and 60 periods of QWs. With a pixel fill factor of 80% and a substrate transmission of 70.9%, the external QE is 14.4%. To yield the theoretical conversion efficiency CE, the photoconductive gain was measured and is 0.25 at 5 V, from which CE is predicted to be 3.6%. This value is in agreement with the 3.5% from the FPA measurement. Meanwhile, the dark current is measured to be 2.1 × 10 -6 A/cm 2 at 43 K. For regular infrared imaging above 8 μm, the FPA will have an NETD of 16 mK at 2 ms integration time in the presence of 260 read noise electrons, and it increases to 22 mK at 51 K. The highest operability of the tested FPAs is 99.967%. With the CE agreement, we project the FPA performance in the far infrared regime up to 30 μm cutoff.

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The QWIP focal plane assembly for NASA's Landsat Data Continuity Mission

Cited by 14 publications

References 0 publications

C-QWIPs for space exploration

C-QWIPs for space exploration

The Thermal Infrared Sensor (TIRS) on Landsat 8: Design Overview and Pre-Launch Characterization

C-QWIPs for far infrared detection

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