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273 results on '"Dupont, Emmanuel"'

55. Human connexin31.9, unlike its orthologous protein connexin30.2 in the mouse, is not detectable in the human cardiac conduction system

Author

Kreuzberg, Maria M., primary, Liebermann, Marcus, additional, Segschneider, Sara, additional, Dobrowolski, Radoslaw, additional, Dobrzynski, Halina, additional, Kaba, Riyaz, additional, Rowlinson, Giselle, additional, Dupont, Emmanuel, additional, Severs, Nicholas J., additional, and Willecke, Klaus, additional

Published
2009
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63. Type-I interband cascade lasers near 3.2 μm.

Author

Yuchao Jiang, Lu Li, Yang, Rui Q., Gupta, James A., Aers, Geof C., Dupont, Emmanuel, Baribeau, Jean-Marc, Xiaohua Wu, and Johnson, Matthew B.

Subjects
SEMICONDUCTOR lasers, QUANTUM wells, QUANTUM well lasers, OPTICAL fiber cladding, SUPERLATTICES, CURRENT density (Electromagnetism)
Abstract

Interband cascade (IC) lasers have been demonstrated based on type-I InGaAsSb/AlAsSb quantum well (QW) active regions. These type-I IC lasers are composed of 6-cascade stages and InAs/AlSb superlattice cladding layers. In contrast to the use of quinary AlGaInAsSb barriers for active region in previous type-I QW lasers, the type-I QW active region in each stage is sandwiched by digitally graded multiple InAs/AlSb QW electron injector and GaSb/AlSb QW hole injector. The fabricated type-I IC lasers were able to operate in continuous wave and pulsed modes at temperatures up to 306 and 365 K, respectively. The threshold current densities of broad-area lasers were around 300 A/cm2 at 300 K with a lasing wavelength near 3.2 μm. The implications and prospects of these initial results are discussed. [ABSTRACT FROM AUTHOR]

Published
2015
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66. Image Smearing in a Quantum Well Infrared Photodetector Monolithically Integrated With a Light Emitting Diode

Author

DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO), Chiu, Shen, Dupont, Emmanuel, DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO), Chiu, Shen, and Dupont, Emmanuel

Abstract

The recent advances in infrared sensing technology has made it possible to use infrared sensors to support environmental observations, surveillance, threat detection, tracking, and target identification. For ballistic missile defence (BMD) related applications, the most important detector requirements are: high sensitivity, high uniformity, large format, and multicolor capabilities. Quantum well infrared photodetector (QWIP) is a relatively new candidate technology for BMD applications. It has become one of the most promising near-term infrared technologies to meet mid-course detection requirements because of its wavelength flexibility in mid-infrared, far-infrared, and very far-infrared regions, as well as multicolor capabilities. Canadian QWIP technology is based on monolithic integration of quantum well infrared photodetector with a light emitting diode (QWIP-LED), and was pioneered by Dr. H.C. Liu of Institute for Microstructural Sciences, National Research Council of Canada. The goal of the present program is to realize a 1x1 sq cm(exp 2) two-color QWIP-LED imaging device by March 2001 and, eventually, to develop a very large format (up to 4x4 sq cm(exp 2)) prototype imaging camera. The success of the QWIP-LED depends critically on the extent of spatial lateral spreading of both photocurrent generated in the QWIP and near infrared photons emitted by the LED as they escape from the QWIP-LED layers. According to a LED model proposed by Schnitzer et al., there appears to be a trade-off between a high LED external quantum efficiency and a small photon lateral spread, the former being a necessary condition for achieving high detector sensitivity. The model predicts that as much as 25 reincarnations of the originally emitted NIR photons (as they spread laterally within the QWIP-LED) are required for most of the LED emitted light to escape., in English and French; Text in English.

Published
1998

70. QWIP-LED pixelless imaging

Author

Liu, Hui C., primary, Dupont, Emmanuel, additional, Byloos, M., additional, Buchanan, Margaret, additional, Song, Chunying, additional, and Wasilewski, Zbigniew R., additional

Published
2002
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74. Quantum well infrared detection devices

Author

Liu, Hui C., primary, Song, Chunying, additional, Shen, Aidong, additional, Dudek, Richard, additional, Gao, Ming, additional, Dupont, Emmanuel, additional, Wasilewski, Zbigniew R., additional, Buchanan, Margaret, additional, Wilson, P. H., additional, Robinson, Brad J., additional, Thompson, David A., additional, Brown, Gail J., additional, Szmulowicz, Frank, additional, and Ehret, James E., additional

Published
2001
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83. Planar integrated metasurfaces for highly-collimated terahertz quantum cascade lasers.

Author

Guozhen Liang, Dupont, Emmanuel, Fathololoumi, Saeed, Wasilewski, Zbigniew R., Ban, Dayan, Hou Kun Liang, Ying Zhang, Siu Fung Yu, Li, Lianhe H., Giles Davies, Alexander, Linfield, Edmund H., Hui Chun Liu, and Qi Jie Wang

Subjects
*TERAHERTZ technology, *QUANTUM cascade lasers, *SURFACE plasmons, *SURFACE emitting lasers, *WAVEGUIDES, *PHOTONICS, *PHOTODETECTORS
Abstract

We report planar integration of tapered terahertz (THz) frequency quantum cascade lasers (QCLs) with metasurface waveguides that are designed to be spoof surface plasmon (SSP) out-couplers by introducing periodically arranged SSP scatterers. The resulting surface-emitting THz beam profile is highly collimated with a divergence as narrow as ∼4° × 10°, which indicates a good waveguiding property of the metasurface waveguide. In addition, the low background THz power implies a high coupling efficiency for the THz radiation from the laser cavity to the metasurface structure. Furthermore, since all the structures are in-plane, this scheme provides a promising platform where well-established surface plasmon/metasurface techniques can be employed to engineer the emitted beam of THz QCLs controllably and flexibly. More importantly, an integrated active THz photonic circuit for sensing and communication applications could be constructed by incorporating other optoelectronic devices such as Schottky diode THz mixers, and graphene modulators and photodetectors. [ABSTRACT FROM AUTHOR]

Published
2014
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92. Downregulation of Immunodetectable Connexin43 and Decreased Gap Junction Size in the Pathogenesis of Chronic Hibernation in the Human Left Ventricle

Author

Kaprielian, Raffi R., primary, Gunning, Mark, additional, Dupont, Emmanuel, additional, Sheppard, Mary N., additional, Rothery, Stephen M., additional, Underwood, Richard, additional, Pennell, Dudley J., additional, Fox, Kim, additional, Pepper, John, additional, Poole-Wilson, Philip A., additional, and Severs, Nicholas J., additional

Published
1998
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