Development of an infrared detector: Quantum well infrared photodetector

Lü, Wei; Li, Ling; Zheng, HongLou; Wang, Xu; Xiong, Dayuan

doi:10.1007/s11433-009-0131-0

Cited by 8 publications

(8 citation statements)

References 25 publications

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“…Quantum well infrared photodetectors (QWIPs) based on the GaAs/AlGaAs material system have been studied in detail and have already been used in large format focal plane arrays [3][4][5][6]. Because of its mature growth and processing technology, QWIPs have been investigated as an alternative for VLWIR detection [7,8].…”

Section: Introductionmentioning

confidence: 99%

Optimization of top coupling grating for very long wavelength QWIP based on surface plasmon

et al. 2017

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Abstract:The relative coupling efficiency of two-dimensional (2D) grating based on surface plasmon for very long wavelength quantum well infrared detector is analyzed by using the three-dimensional finite-difference time domain (3D-FDTD) method algorithm. The relative coupling efficiency with respect to the grating parameters, such as grating pitch, duty ratio, and grating thickness, is analyzed. The calculated results show that the relative coupling efficiency would reach the largest value for the 14.5 m incident infrared light when taking the grating pitch as 4.4 m, the duty ratio as 0.325, and the grating thickness as 0.07 m, respectively.

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Section: Introductionmentioning

confidence: 99%

Optimization of top coupling grating for very long wavelength QWIP based on surface plasmon

et al. 2017

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“…The band-edge potential varies from layer to layer due to the difference in the band gaps, and a periodically varying potential is produced in the structure with a period equal to the sum of the widths of two consecutive layers [3]. This is because of the importance of the developed device in achieving novel characteristics in the fields of optical communications, thermal imaging, and sensor networking, etc.…”

Section: Introductionmentioning

confidence: 99%

“…QWIPs are well suited for both high speed and frequency applications, especially in those situations where lasers are usually used [3,4]. This type of optical detectors enjoys several benefits.…”

Section: Introductionmentioning

confidence: 99%

QWIP focal plane array theoretical model of 3-D imaging LADAR system

Mashade

Abouelez

2016

Radioelectron.Commun.Syst.

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The aim of this research is to develop a model for the direct detection three-dimensional (3-D) imaging LADAR system using Quantum Well Infrared Photodetector (QWIP) Focal Plane Array (FPA). This model is employed to study how to add 3-D imaging capability to the existing conventional thermal imaging systems of the same basic form which is sensitive to 3-5 mm (mid-wavelength infrared, MWIR) or 8-12 mm (long-wavelength infrared, LWIR) spectral bands. The integrated signal photoelectrons in case of short integration time is required to transmit laser pulses with higher energy in order to obtain photoelectrons nearest those values obtained from the background photoelectrons in thermal imaging system with the longer interval of time. Since the operating conditions of the proposed system are of low levels for speckle diversity and high levels of signal photoelectrons, it was shown that the signal obeys the Gaussian probability density function. The evaluation of system performance of the proposed model shows that it needs a detector with low dark current and high transmitted energy to obtain satisfactory parameter values.

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“…The goal of our experiment is to carry out QIP using trapped ions. We are aware of some experimental and theoretical progress towards this aim [20][21][22][23]. To make trapped ions for QIP, we require the ions to be in a state of crystallization, and thus we must further cool the ions down to the vibrational ground state by application of the sideband cooling technique.…”

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confidence: 99%

A cloud of laser cooled 40Ca+ in a linear ion trap

Zhou

Xie

et al. 2010

Chin. Sci. Bull.

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A cloud of 40 Ca + is successfully trapped and cooled using the radiation of a red-detuned 397 nm laser beam and a resonant 866 nm laser beam in our prototype linear ion trap, which was designed and constructed for studying quantum information processing. We have characterized the size of the ion cloud, estimating the temperature to be in the order of milli-Kelvins.ion trap, laser cooling, quantum information processing Citation:Laser-cooled trapped ions are considered as promising candidates for the investigation and implementation of quantum information processing (QIP). There have been experimental demonstrations for simple quantum algorithms with trapped ions [1] and for entangling eight ultra-cold ions in a linear trap [2]. It is thought that scalable QIP with trapped ions could be carried out by moving the ions from one zone to another in a multi-trap device [3] or by entangling spatially separate ions by entangling the emitted photons [4]. There are approximately 25 research groups studying QIP with various trapped ion species. The leading groups at NIST and Innsbruck are employing 9 Be + [5] and 40 Ca + [6]. The Oxford groups are working with 40 Ca + [7], and other groups are exploring 111 Cd + [8], 171 Yb + [9], 43 Ca + [10], 138 Ba + [11] and 88 Sr + [12]. Since ion traps could potentially provide a very clean and isolated space for confinement, the ultra-cold ions trapped inside could be manipulated coherently, which favors storage and processing of quantum information [13]. We may encode qubits in the electronic levels of the ions and manipulate these qubits by lasers either individually or globally. Interactions between *These authors contributed equally to this work †Corresponding authors (email: hxueren@wipm.ac.cn; mangfeng@wipm.ac.cn) the qubits occur via the quantized vibrational modes of the ions.This paper describes recent work on the successful trapping of a cloud of 40 Ca + ions in our prototype linear ion trap. This is the first step toward the QIP with a line of trapped ions undertaken in China. The linear ion trap we built consists of four radio frequency (RF) blades, two end-cap tips and two compensation electrodes. In comparison with the traditional linear ion trap with four RF-rods and two ring end-caps, our trap could provide stronger trapping potential and cleaner trapping space due to the reduction in trap size and the minimization of the ceramic surface facing toward the trap.Our trap setup is described in Figure 1, the opposing RF blades are separated by 1.6 mm, and the spacing between the two end-cap tips is 5.0 mm. The ions are produced in the trap center by the electron bombardment on an atomic beam from the calcium oven. The linear trap is encapsulated in a vacuum chamber connected to a 40 L/s ion pump (Vacion plus 40 diode pump, Varian Inc) plus a titanium sublimation pump (Varian). Chamber pressures below 10 −9 mbar can be inferred from the measured current through the ion pump (≤0.1 μA). To trap ions, a prototype tunable RF drive running

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Development of an infrared detector: Quantum well infrared photodetector

Cited by 8 publications

References 25 publications

Optimization of top coupling grating for very long wavelength QWIP based on surface plasmon

Optimization of top coupling grating for very long wavelength QWIP based on surface plasmon

QWIP focal plane array theoretical model of 3-D imaging LADAR system

A cloud of laser cooled 40Ca+ in a linear ion trap

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