QWIP as solution for mobile VLWIR imaging systems

Ivanov, Ruslan; Evans, Dean; Smuk, Sergiy; Diel, Waldemar; Rihtnesberg, David; Höglund, Linda; Gulde, Max; Costard, E.

doi:10.1117/12.2588556

Cited by 5 publications

(5 citation statements)

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“…HgCdTe uniformity varies widely by device but tends to be less stable than T2SLS over time and multiple cooldown cycles, with typical RFPN values above 70% of NETD. This study only addressed RFPN and did not consider operability or cluster defects, improvements in which may favour III-V materials [17,21,23,61,62,[68][69][70][71][72][73][74][75].…”

Section: Recently Reported Infrared Detector Performancementioning

confidence: 99%

Sensor performance and cut-off wavelength tradeoffs of III-V focal plane arrays

2024

Opto-Electronics Review

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Infrared detector technologies engineered from III-V semiconductors such as strained-layer superlattice, quantum well infrared photodetectors, and quantum dot infrared photodetectors provide additional flexibility to engineer bandgap or spectral response cut-offs compared to the historical high-performance detector technology of mercury/cadmium/telluride. The choice of detector cut-off depends upon the sensing application for which the system engineer is attempting to maximize performance within an expected ensemble of operational scenarios that define objects or targets to be detected against specific environmental backgrounds and atmospheric conditions. Sensor performance is typically characterised via one or more metrics that can be modelled or measured experimentally. In this paper, the authors will explore the impact of detector cut-off wavelength with respect to different performance metrics such as noise equivalent temperature difference and expected target detection or identification ranges using analytical models developed for several representative sensing applications encompassing a variety of terrestrial atmospheric conditions in the mid-wave and long-wave infrared wavelength bands. The authors will also report on their review of recently published literature concerning the relationships between cut-off wavelength and the other detector performance characteristics such as quantum efficiency or dark current for a variety of detector technologies.

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Section: Recently Reported Infrared Detector Performancementioning

confidence: 99%

Sensor performance and cut-off wavelength tradeoffs of III-V focal plane arrays

2024

Opto-Electronics Review

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“…Another investigated property of the array includes the bias dependence of its MTF. The bias-dependent optical response offers QWIP detectors wide tunability to fill a broad range of applications [3,4,5]. To answer if such adjustment affects the MTF value, we repeated the experiment for a set of applied biasing voltages under fixed illumination.…”

Section: Mtfmentioning

confidence: 99%

“…QWIP arrays are widely recognized for their excellent imagery properties in the thermal infrared spectral range (LWIR, 7.5-14 µm) [1]. Taking advantage of the technology-specific properties, IRnova have recently demonstrated that QWIP is a solid and flexible platform for advanced detector designs fulfilling requirements of such demanding applications as dual-color radiometry for Earth observation, polarimetric imaging and optical gas detection (OGI) [2,3,4,5]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

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QWIP: still the best solution for high-end applications in LWIR

Ivanov,

Högnadottir,

Ramos

et al. 2023

Infrared Technology and Applications XLIX

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Quantum well infrared photodetector (QWIP) technology is an excellent solution for tactical applications due to the unmatched image uniformity, stability, and pixel operability (typically <99.9%). IRnova have a high-volume production of QWIP detectors in both QVGA and VGA formats since 1999. In 2017 a VGA format QWIP with 15 μm pitch was released, which has demonstrated excellent sensitivity (expressed as noise equivalent temperature difference (NETD)) of 30 mK at F/2 and 100 Hz frame rate. QWIPs also enable compact designs for polarimetric imaging by implementing polarization-sensitive lamellar gratings directly onto the detector pixels. Such polarimetric LWIR detectors (peak absorption at 8.5 μm) have been fabricated at IRnova as both QVGA and VGA format FPAs on 30 and 15 μm pitch, respectively. Polarimetric imaging with these detectors is demonstrated in this work, showing polarimetric contrast as high as 57±5 % for the QVGA format detectors, while the VGA format arrays provide enhanced spatial resolution at the expense of a lower polarization contrast (≈21±2 %). Finally, to meet the demand of highly sensitive and reliable HD LWIR detectors, a 1280×1024 QWIP detector on 10 μm pitch is the next targeted format of IRnova’s QWIP sensors. In this work, the anticipated performance of such detectors will be presented based on the simulation result using the in-house developed tools. The modelling takes into account the relevant ROIC parameters, as well as scaling of the detector performance with pixel size.

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“…These features provide QWIPs with unique advantages in gas detection. IRnova AB, U.S. Army Research Laboratory, and the Institute of Shanghai Technical Physics have designed and fabricated QWIPs targeting at 10.5 µm central wavelength for gas detector [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Resonance-Enhanced Quantum Well Micropillar Array with Ultra-Narrow Bandwidth and Ultra-High Peak Quantum Efficiency

Shao

et al. 2022

Electronics

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Infrared cameras with narrow-band detection capability are widely used for SF6 gas detection, which is an essential part of power equipment inspection. Narrow-band detection is usually achieved by a combination of quantum well infrared photodetectors (QWIPs) and narrow-band filters. Improving the quantum efficiency of QWIPs and reducing the detection bandwidth are important ways to improve camera performance. In this study, a back-incident-type device of quantum well micropillar array targeting at a 10.5 μm central wavelength is designed and studied by three-dimensional simulation. The operating mechanism of the device was determined by investigating the effect of the device geometry on the quantum efficiency. The enhanced absorption capability of the device mainly comes from the Fabry–Pérot resonance and the antireflection effect. The final device exhibits a remarkable peak quantum efficiency of 83% at 10.5 μm and an ultra-narrow spectral bandwidth of 0.2 μm. These excellent properties are achieved without an antireflective film and narrow-band filter, which can significantly improve the narrow-band capability and integration of the system; the dark current reduces to be 0.2762 times due to the low-duty cycle. These properties indicate that the structure of the quantum well micropillar array is of great significance to the development of QWIPs used in gas detection.

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QWIP as solution for mobile VLWIR imaging systems

Cited by 5 publications

References 0 publications

Sensor performance and cut-off wavelength tradeoffs of III-V focal plane arrays

Sensor performance and cut-off wavelength tradeoffs of III-V focal plane arrays

QWIP: still the best solution for high-end applications in LWIR

Resonance-Enhanced Quantum Well Micropillar Array with Ultra-Narrow Bandwidth and Ultra-High Peak Quantum Efficiency

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