Development of mid-wavelength QWIP FPA

Ozaki, Kazuo; Uchiyama, Yuji; Matsukura, Yusuke; Kajihara, Nobuyuki; Fujii, Toshio

doi:10.1117/12.603350

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…Figure 10b shows the dark current density at different doping concentrations versus the bias voltage. Dark current increases by orders of magnitude with the increasing doping concentration, which is consistent with the findings in [29]. For FPA, a small ratio of dark current to QE should be chosen to reduce the noise equivalent temperature difference (NETD).…”

supporting

confidence: 84%

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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confidence: 84%

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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“…As summarised by the first author in a previous publication [3], there are various articles in the literature reporting higher ability of normal incident radiation detection by quantum wells (QWs) constructed with higher x InxGa1-xAs [4][5][6][7][8][9]. Normal incident radiation detection ability of these structures was attributed to various reasons such as band mixing effects [7], spin-flip inter-sub band transitions due to strong spin-orbit interaction [5], and higher interface scattering [9].…”

Section: Introductionmentioning

confidence: 99%

Grating-free high-x InP/InxGa1-xAs mid-wavelength infrared QWIP focal plane array

2024

Opto-Electronics Review

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The authors report the characteristics of a diffraction-grating-free mid-wavelength infrared InP/In0.85Ga0.15As quantum well infrared photodetector focal plane array with a 640 × 512 format and a 15 m pitch. Combination of a normal incident radiation sensing ability of the high-x InxGa1-xAs quantum wells with a large gain property of the InP barriers led to a diffraction-grating-free quantum well infrared photodetector focal plane array with characteristics displaying great promise to keep the status of the quantum well infrared photodetector as a robust member of the new generation thermal imaging sensor family. The focal plane array exhibited excellent uniformity with noise equivalent temperature difference nonuniformity as low as 10% and a mean noise equivalent temperature difference below 20 mK with f/2 optics at 78 K in the absence of grating. Elimination of the diffraction-grating and large enough conversion efficiency (as high as 70% at a −3.5 V bias voltage) abolish the bottlenecks of the quantum well infrared photodetector technology for the new generation very small-pitch focal plane arrays.

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High-x InP/InxGa1−xAs quantum well infrared photodetector

Besikci

2018

Infrared Physics & Technology

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Development of mid-wavelength QWIP FPA

Cited by 5 publications

References 4 publications

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

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

Grating-free high-x InP/InxGa1-xAs mid-wavelength infrared QWIP focal plane array

High-x InP/InxGa1−xAs quantum well infrared photodetector

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