89 GHz zero‐bias Schottky detector for direct detection radiometry in European satellite programme MetOp‐SG

2014 ◽  
Vol 50 (8) ◽  
pp. 606-608 ◽  
Author(s):  
M. Hoefle ◽  
A. Penirschke ◽  
O. Cojocari ◽  
T. Decoopman ◽  
M. Trier ◽  
...  
Keyword(s):  
Direct Detection ◽  
Zero Bias ◽  
European Satellite

InGaAs zero bias backward diodes for millimeter wave direct detection

2001 ◽  
Vol 22 (5) ◽  
pp. 200-202 ◽  
Author(s):  
J.N. Schulman ◽  
D.H. Chow ◽  
D.M. Jang
Keyword(s):  
Millimeter Wave ◽  
Direct Detection ◽  
Zero Bias

Sb-heterostructure zero-bias diodes for direct detection beyond 100 GHz

2000 ◽  
Author(s):  
Joel N. Schulman ◽  
David H. Chow ◽  
Edward T. Croke ◽  
Carl W. Pobanz ◽  
Howard L. Dunlap ◽  
...  
Keyword(s):  
Direct Detection ◽  
Zero Bias

NOISE AND THZ RECTIFICATION CHARACTERISTICS OF ZERO-BIAS QUANTUM TUNNELING SB-HETEROSTRUCTURE DIODES

2004 ◽  
Vol 14 (03) ◽  
pp. 664-669 ◽  
Author(s):  
ARTTU LUUKANEN ◽  
ERICH N. GROSSMAN ◽  
HARRIS P. MOYER ◽  
JOEL N. SCHULMAN
Keyword(s):  
Quantum Tunneling ◽  
Room Temperature ◽  
Direct Detection ◽  
Intrinsic Noise ◽  
Johnson Noise ◽  
Zero Bias ◽  
Submillimeter Wavelength ◽  
Noise Characteristics ◽  
Tunneling Diode ◽  
Noise Measurements

The Sb -heterostructure quantum tunneling diode, fabricated from epitaxial layers of InAs and AlGaSb , is a recently proposed device for direct detection and mixing in the submillimeter wavelength range. These diodes exhibit especially high curvature in the current-voltage characteristic that produces the rectification or mixing without bias. Operation without bias is a highly desirable feature as the device does not suffer from large 1/f noise, a major shortcoming in other devices such as Schottky barrier diodes or resistive room temperature bolometers. In this paper we present the noise characteristics of the diode as a function of the bias voltage. At room temperature and zero bias, the device demonstrates a Johnson noise limited intrinsic noise equivalent power of 1 pW/Hz1/2. In addition to the noise measurements, we present the detection characteristics of the diode at a frequency of 2.5 THz. The measured THz laser response deviates from conventional theoretical prediction based on pure rectification. The reasons for the discrepancy will be discussed.

scholarly journals New tunnel diode for zero-bias direct detection for millimeter-wave imagers

2001 ◽  
Author(s):  
Edward T. Croke ◽  
Joel N. Schulman ◽  
David H. Chow ◽  
Howard L. Dunlap ◽  
Kevin S. Holabird ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Direct Detection ◽  
Tunnel Diode ◽  
Zero Bias

Detection and Characterization of earth-like Planets

1997 ◽  
Vol 161 ◽  
pp. 299-311 ◽  
Author(s):  
Jean Marie Mariotti ◽  
Alain Léger ◽  
Bertrand Mennesson ◽  
Marc Ollivier
Keyword(s):  
Direct Detection ◽  
Contrast Ratio ◽  
Angular Size ◽  
Physical Nature ◽  
Major Axis ◽  
Infrared Emission ◽  
Space Technology ◽  
Semi Major Axis ◽  
Earth Like Planets ◽  
Visible Wavelengths

AbstractIndirect methods of detection of exo-planets (by radial velocity, astrometry, occultations,...) have revealed recently the first cases of exo-planets, and will in the near future expand our knowledge of these systems. They will provide statistical informations on the dynamical parameters: semi-major axis, eccentricities, inclinations,... But the physical nature of these planets will remain mostly unknown. Only for the larger ones (exo-Jupiters), an estimate of the mass will be accessible. To characterize in more details Earth-like exo-planets, direct detection (i.e., direct observation of photons from the planet) is required. This is a much more challenging observational program. The exo-planets are extremely faint with respect to their star: the contrast ratio is about 10−10at visible wavelengths. Also the angular size of the apparent orbit is small, typically 0.1 second of arc. While the first point calls for observations in the infrared (where the contrast goes up to 10−7) and with a coronograph, the latter implies using an interferometer. Several space projects combining these techniques have been recently proposed. They aim at surveying a few hundreds of nearby single solar-like stars in search for Earth-like planets, and at performing a low resolution spectroscopic analysis of their infrared emission in order to reveal the presence in the atmosphere of the planet of CO H2O and O3. The latter is a good tracer of the presence of oxygen which could be, like on our Earth, released by biological activity. Although extremely ambitious, these projects could be realized using space technology either already available or in development for others missions. They could be built and launched during the first decades on the next century.

A novel enzyme immunoassay for the direct detection of H. pylori antigens in stool

2001 ◽  
Vol 120 (5) ◽  
pp. A492-A493 ◽  
Author(s):  
E HAINDL ◽  
H BENESCH ◽  
A FINCK ◽  
V MUEHISTEIN ◽  
A LEODOLTER ◽  
...  
Keyword(s):  
Enzyme Immunoassay ◽  
Direct Detection ◽  
H Pylori
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