We describe a long wavelength infrared detector where an InAs/GaSb superlattice absorber is surrounded by pair of electron-blocking and hole-blocking unipolar barriers. A 9.9 μm cutoff device without antireflection coating based on this complementary barrier design exhibits responsivity 1.5 A/W dark current density 0.99×10−5 A/cm2 at 77 K under 0.2 V bias. The reaches 300 background limited photodetection (BLIP) operation 87 K, with black-body BLIP D∗ value 1.1×1011 cm Hz1/2/W for f/2 optics

Facebook's corpus of photos, videos, and other Binary Large OBjects (BLOBs) that need to be reliably stored quickly accessible is massive continues grow. As the footprint BLOBs increases, storing them in our traditional storage system, Haystack, becoming increasingly inefficient. To increase efficiency, measured effective-replication-factor BLOBs, we examine underlying access patterns identify temperature zones include hot are accessed frequently warm far less often. Our overall BLOB system...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation L. Höglund, D. Z. Ting, A. Khoshakhlagh, Soibel, C. J. Hill, Fisher, S. Keo, Gunapala; Influence of radiative non-radiative recombination on the minority carrier lifetime in midwave infrared InAs/InAsSb superlattices. Appl. Phys. Lett. 25 November 2013; 103 (22): 221908. https://doi.org/10.1063/1.4835055...

In this work, we investigate the high temperature performance of mid-wavelength infrared InAsSb-AlAsSb nBn detectors with cut-off wavelengths near 4.5 μm. The quantum efficiency these devices is 35% without antireflection coatings and does not change in 77–325 K range, indicating potential for room operation. current generation shows an increase operational bias temperature, which attributed to a shift Fermi energy level absorber. Analysis device that can be further improved. dark stays...

Background Contemporary cancer diagnostics are becoming increasing reliant upon sophisticated new molecular methods for analyzing genetic information. Limiting the scope of these technologies is lack adequate solid tumor tissue samples. Patients may present with tumors that not accessible to biopsy or longitudinal monitoring. One attractive alternate source cells in peripheral blood. These rare circulating (CTC) require enrichment and isolation before analysis can be performed. Current CTC...

The development of an interband cascade laser (ICL) based spectroscopic trace-gas sensor for the simultaneous detection two atmospheric trace gases is reported. performance was evaluated using ICLs capable targeting formaldehyde (H2CO) and ethane (C2H6). Minimum limits 3.5 ppbV H2CO 150 pptV C2H6 demonstrated with a 1 s integration time. deployed field measurements H2CO, laboratory quantification both are A cross comparison concentration data collected by collocated commercial employing...

Epitaxially grown self-assembled InAs-InGaAs-GaAs quantum dots (QDs) are exploited for the development of large-format long-wavelength infrared focal plane arrays (FPAs). The dot-in-a-well (DWELL) structures were experimentally shown to absorb both 45deg and normal incident light, therefore, a reflection grating structure was used enhance efficiency. devices exhibit peak responsivity out 8.1 mum, with detectivity reaching ~1times10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Mid-wavelength infrared (MWIR) and long-wavelength (LWIR) 1024 × pixel quantum well photodetector (QWIP) focal planes have been demonstrated with excellent imaging performance. The MWIR QWIP detector array has a noise equivalent differential temperature (NEΔT) of 17 mK at 95 K operating f/2.5 optics 300 background the LWIR NEΔT 13 70 same optical conditions as after subtraction system noise. Both shown limited performance (BLIP) 90 temperatures respectively, similar conditions. In this...

Continuous-wave operation of a mid-infrared (∼3.3 µm) interband cascade laser has been demonstrated at temperatures up to 264 K. The also operated continuously with thermoelectric cooler near 260 K for more than 1900 h without observable degradation.

We describe the concept of submonolayer quantum dot infrared photodetector (SML QDIP) and report experimental device results on long-wavelength detection. An SML QDIP structure was fabricated into megapixel focal plane arrays, which produced clear images up to 80 K. Detectors in showed a responsivity peak at 7.8 μm noise equivalent temperature difference 33 mK 70

A free space optical (FSO) link utilizing midinfrared (mid-IR) interband cascade lasers has been demonstrated in the 3- to 5-¿m atmospheric transmission window with data rates up 70 Mb/s and bit-error rate (BER) less than 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-8</sup> . The performance of mid-IR FSO compared a near-IR under various fog conditions using an indoor communication testbed. These experiments lower attenuation...

We investigated mid-infrared interband cascade laser structures as photodetectors, which are sensitive to normal incidence and operate in photovoltaic mode at room temperature. The proposed operation principle of these detectors is based on the unique combination photoexcitation much faster intersubband relaxation well tunneling recombination, allows for efficient collection photoexcited carriers. Peak responsivity detectivity 21 mA/W 7.1×108cmHz1∕2∕W λ=4.0μm obtained a device with cutoff...

In the past decade, there has been active research on infrared detectors based intersubband transitions in self-assembled quantum dots (QDs). two years, at least four groups have independently demonstrated focal plane arrays this technology. paper, progress from first raster scanned image obtained with a QD detector to demonstration of 640 512 imager QDs is reviewed. particular, emphasis will be placed novel dots-in-a-well (DWELL) design, which represents hybrid between conventional...

We demonstrate an InAsSb nBn detector monolithically integrated with a microlens fabricated on the back side of detector. The increase in optical collection area resulted five-fold enhancement responsivity to Rp = 5.5 A/W. increases further 8.5 A/W antireflection coating. These 4.5 μm cut-off wavelength coated detectors microlenses exhibited detectivity D* (λ) 2.7 × 1010 cmHz0.5/W at T 250 K, which can be reached easily single-stage thermoelectric cooler or passive radiator space...

We studied long and very wavelength InAs/InAsSb superlattice barrier infrared detectors that contain p-type absorber layers in order to take advantage of the longer electron diffusion length for quantum efficiency (QE) enhancement. While they can achieve higher QE than devices use only n-type absorbers, their dark current characteristics are affected by presence metallurgical surface p–n junctions, best operated under lower biasing conditions where tunneling currents less pronounced. Rather...

A broad-area midinfrared interband cascade (IC) laser has been demonstrated with a threshold current as low ∼630A∕cm2 at 300K. Despite exhibiting large specific thermal resistance (∼56Kcm2∕kW 172K), the device delivered cw power near 200mW/facet 500mA and 83K lased in mode up to 172K. 0.5-mm-long of ∼253mW/facet 400mA 82K, had efficiency high 26% ∼80K. Narrow mesa stripe IC lasers relatively higher density, yet temperatures 237 350K pulsed modes, respectively. The feasibility operation...

We describe the demonstration of a 1024 × pixel long-wavelength infrared focal plane array based on an InAs-GaSb superlattice absorber surrounded by electron-blocking and hole-blocking unipolar barrier. An 11.5-μm cutoff without antireflection coating this complementary barrier detector design has yielded noise equivalent differential temperature 53 mK at operating 80 K, with 300 K background f/2 cold-stop.

The influence of radiative recombination on the minority carrier lifetime in mid-wavelength InAs/InAsSb superlattices was investigated. From lifetime's dependence temperature, photon recycling, and concentration, it demonstrated that dominates for concentrations &amp;gt;5 × 1014 cm−3, Shockley-Read-Hall starts to dominate &amp;lt;5 cm−3. An observed increase with increasing superlattice thickness attributed good agreement between measured theoretical values recycling factor obtained.

We extended the cut-off wavelength λc of bulk InAsSb nBn detectors to = 4.6 μm at T 200 K by incorporating series single InSb monolayer into absorber. Detectors with 2 thick absorber showed a temperature independent quantum efficiency QEm ≈ 0.45 for back-side illumination without antireflection coating. The dark current density was jd 5 × 10−6 A/cm2 150 K, and increased 10−3 K. At temperatures below, demonstrated photodetectors operate in background limited performance mode, detectivity...

Quantum well infrared photodetectors (QWIPs) are known for their stability, high pixel-to-pixel uniformity, and high-pixel operability, which essential large area imaging arrays. In this paper, we discuss the initial demonstration of QWIP devices, many years progress that propelled technology toward format focal plane addition, present some potential applications in science medicine.