Room-Temperature Heterodyne Detection up to 110 GHz With a Quantum-Well Infrared Photodetector

Grant, P. D.; Dudek, R.; Buchanan, M.; Liu, H.C.

doi:10.1109/lpt.2006.884267

Cited by 35 publications

(29 citation statements)

References 6 publications

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“…While QDIPs have shown potential to outperform QWIPs due to the 3D confinement, that allows absorption of normal incident radiation and provides a more adequate condition for higher temperature operation, they have not yet delivered and the QWIPs are already in the market. QWIPs operating at room temperature have already been reported using laser as a radiation source . Although there are no doubts about the major progress achieved with QWIPs in the past 10 years, two challenges remained for imaging (using thermal sources), namely room temperature operation and, in particular for the arsenides, detection within the so‐called “forbidden gap” between 1.7 and 2.5 microns.…”

Section: Introductionmentioning

confidence: 99%

Progress in Symmetric and Asymmetric Superlattice Quantum Well Infrared Photodetectors

et al. 2019

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Herein, two challenges are addressed, which quantum well infrared photodetectors (QWIPs), based on III-V semiconductors, face, namely: photodetection within the so-called "forbidden gap", between 1.7 and 2.5 microns, and room temperature operation using thermal sources. First, to reach this forbidden wavelength range, a QWIP which consists of a superlattice structure with a central quantum well (QW) with a different thickness is presented. The different QW in the symmetric structure, which plays the role of a defect in the otherwise periodic structure, gives rise to localized states in the continuum. The proposed InGaAs/InAlAs superlattice QWIP detects radiation around 2.1 microns, beyond the materials bandoffset. Additionally, the wavefunction parity anomaly is explored to increase the oscillator strength of the optical transitions involving higher order states. Second, with the purpose of achieving room temperature operation, an asymmetric InGaAs/InAlAs superlattice, in which the QW with a different thickness is not in the center, is used to detect infrared radiation around 4 microns at 300 K. This structure operates in the photovoltaic mode because it gives rise to states in the continuum which are localized in one direction and extended in the other, leading to a preferential direction for current flow.

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Section: Introductionmentioning

confidence: 99%

Progress in Symmetric and Asymmetric Superlattice Quantum Well Infrared Photodetectors

et al. 2019

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“…Currently available resonant optical cavity mercury cadmium telluride photodiodes achieve 0.1 cm −1 (3 GHz) bandwidth. In the near future, quantum‐well‐based structures are very promising, as 3.5 cm −1 (>100 GHz) bandwidth has been demonstrated (Grant et al, ). An Advanced Multiplexing Mode is defined as relying on such devices, which would allow a 1 cm −1 bandwidth.…”

Section: A Brief Introduction To Laser Heterodyne Radiometrymentioning

confidence: 99%

Evaluation of laser heterodyne radiometry for numerical weather prediction applications

Smith

Havemann

Hoffmann

et al. 2018

Quart J Royal Meteoro Soc

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This article reports the results of a preliminary mission study to assess the potential of space-borne laser heterodyne radiometry (LHR) for the remote sensing of temperature for assimilation in a numerical weather prediction (NWP) model. The LHR instruments are low cost and small in size, lending themselves to a wide variety of satellite platforms. The impact of different configurations of an idealized LHR instrument is assessed against the Infrared Atmospheric Sounding Interferometer (IASI), via single-column linear information content analysis, using inputs consistent with the background errors of the Met Office 4D-Var assimilation system. Multiplexed configurations give promising results, in particular for sounding of upper-atmospheric temperatures.KEYWORDS DFS, IASI, information content, laser heterodyne radiometer, numerical weather prediction, temperature sounding, upper atmosphere 1 This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…Consequently, the iterative reconstruction methods have been proposed for CT reconstruction, such as the algebraic reconstruction technique (ART) [4], the simultaneous iterative reconstruction technique (SIRT) [5] and ordered subsets expectation maximisation (OSEM) [6]. These algorithms have been applied in X-ray CT previously, but few in THz CT.On the hardware side, the THz quantum-cascade laser (QCL) is one of the most important THz solid-state sources, having high output power and a compact structure [7], and the THz quantum-well photodetector (QWP) is a very promising detector that has the characteristics of high sensitivity, a narrow response range and fast photoresponse [8]. In this Letter, we first present a THz 3D imaging system based on a THz QCL and a QWP, then reconstruct a cross-sectional image of the sample by the ART algorithm, and finally demonstrate the 3D reconstruction image and point out the places that need to be improved in the future.…”

mentioning

confidence: 99%

“…On the hardware side, the THz quantum-cascade laser (QCL) is one of the most important THz solid-state sources, having high output power and a compact structure [7], and the THz quantum-well photodetector (QWP) is a very promising detector that has the characteristics of high sensitivity, a narrow response range and fast photoresponse [8]. In this Letter, we first present a THz 3D imaging system based on a THz QCL and a QWP, then reconstruct a cross-sectional image of the sample by the ART algorithm, and finally demonstrate the 3D reconstruction image and point out the places that need to be improved in the future.…”

mentioning

confidence: 99%

Three‐dimensional imaging with terahertz quantum cascade laser and quantum well photodetector

Zhou

Tan

et al. 2015

Electron. lett.

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A three-dimensional (3D) terahertz (THz) computed tomography system with a THz quantum cascade laser as the source and a quantum well photodetector as the receiver is demonstrated. By utilising the algebraic reconstruction technique for image reconstruction, both the external and internal structures of the cross-section are revealed. The iterative algorithm not only reduces the projections, but also provides good suppression of the beam hardening effect. Finally, the 3D image is built by stacking the images at different heights.Introduction: In the field of three-dimensional (3D) imaging, computed tomography (CT) is a significant technique that is first applied in the X-ray frequency band, which reveals the cross-sectional image of an object by using the transmitted signals and image reconstruction algorithms. However, the high-power of X-rays limits its utilisation because of the dangerous ionising effect and the low contrast for soft materials. Compared with X-rays, terahertz (THz) radiation possesses low photon energy, a broad spectra range and moderate penetration for many packaging materials. Since the first THz CT demonstration was reported in 2002 by Ferguson et al.[1], it has been proposed for the 3D imaging of different objects in the industrial, pharmaceutical to biomedical fields [2]. For the CT technique, choosing an appropriate reconstruction algorithm is of great importance. The most efficient and widely used algorithm of CT reconstruction is the filter back-projection (FBP) method, which is based on the Radon inverse transformations from the projection data. In practice, FBP suffers from several disadvantages such as beam hardening, noise sensitivity and image aberration in the case of an insufficient number of angle samplings [3]. Consequently, the iterative reconstruction methods have been proposed for CT reconstruction, such as the algebraic reconstruction technique (ART) [4], the simultaneous iterative reconstruction technique (SIRT) [5] and ordered subsets expectation maximisation (OSEM) [6]. These algorithms have been applied in X-ray CT previously, but few in THz CT.On the hardware side, the THz quantum-cascade laser (QCL) is one of the most important THz solid-state sources, having high output power and a compact structure [7], and the THz quantum-well photodetector (QWP) is a very promising detector that has the characteristics of high sensitivity, a narrow response range and fast photoresponse [8]. In this Letter, we first present a THz 3D imaging system based on a THz QCL and a QWP, then reconstruct a cross-sectional image of the sample by the ART algorithm, and finally demonstrate the 3D reconstruction image and point out the places that need to be improved in the future.

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Room-Temperature Heterodyne Detection up to 110 GHz With a Quantum-Well Infrared Photodetector

Cited by 35 publications

References 6 publications

Progress in Symmetric and Asymmetric Superlattice Quantum Well Infrared Photodetectors

Progress in Symmetric and Asymmetric Superlattice Quantum Well Infrared Photodetectors

Evaluation of laser heterodyne radiometry for numerical weather prediction applications

Three‐dimensional imaging with terahertz quantum cascade laser and quantum well photodetector

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