Voltage tunable terahertz QWIP containing asymmetric step-like coupled double quantum wells

Almassri, M.; Hoştut, Mustafa; Turkoglu, A.; Ergün, Y.

doi:10.1007/s11082-022-03517-x

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…Choi et al [ 20 ] recently reported a voltage-tunable infrared detector based on asymmetrically doped double QW for LWIR detection. The tunability was also demonstrated in THz QWIPs [ 21 ] and quantum dot IR photodetectors [ 22 ]. The bias tunability of QWIP may become a critical property when implemented in an imaging sensor driven by an AI algorithm for autonomous object recognition in the IR [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Bias-Tunable Quantum Well Infrared Photodetector

Biswal,

Yakimov,

Tokranov

et al. 2024

Nanomaterials

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With the rapid advancement of Artificial Intelligence-driven object recognition, the development of cognitive tunable imaging sensors has become a critically important field. In this paper, we demonstrate an infrared (IR) sensor with spectral tunability controlled by the applied bias between the long-wave and mid-wave IR spectral regions. The sensor is a Quantum Well Infrared Photodetector (QWIP) containing asymmetrically doped double QWs where the external electric field alters the electron population in the wells and hence spectral responsivity. The design rules are obtained by calculating the electronic transition energies for symmetric and antisymmetric double-QW states using a Schrödinger–Poisson solver. The sensor is grown and characterized aiming detection in mid-wave (~5 µm) to long-wave IR (~8 µm) spectral ranges. The structure is grown using molecular beam epitaxy (MBE) and contains 25 periods of coupled double GaAs QWs and Al0.38Ga0.62As barriers. One of the QWs in the pair is modulation-doped to provide asymmetry in potential. The QWIPs are tested with blackbody radiation and FTIR down to 77 K. As a result, the ratio of the responsivities of the two bands at about 5.5 and 8 µm is controlled over an order of magnitude demonstrating tunability between MWIR and LWIR spectral regions. Separate experiments using parameterized image transformations of wideband LWIR imagery are performed to lay the framework for utilizing tunable QWIP sensors in object recognition applications.

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Section: Introductionmentioning

confidence: 99%

Bias-Tunable Quantum Well Infrared Photodetector

Biswal,

Yakimov,

Tokranov

et al. 2024

Nanomaterials

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show abstract

“…These imagers contain two vertically stacked focal plane arrays operating in separate IR bands and were proven useful for contrast and object recognition improvements [4,5]. More recently, another unique property of intersubband transitions was explored in the QWIPs, namely the ability to effectively control the QW potential by the external bias, and thus tuning the QWIP spectral sensitivity [6][7][8]. This type of detector can find its niche application in the imaging sensors driven by object recognition AI algorithms requiring on-demand spectral tuning to account for changing environmental conditions and thermal characteristics of the object.…”

Section: Introductionmentioning

confidence: 99%