Active solid-state devices (e.g. – transistors – solid-state diode – Thin active physical layer which is – Heterojunction
Patent
1997-07-14
1999-06-22
Jackson, Jr., Jerome
Active solid-state devices (e.g., transistors, solid-state diode
Thin active physical layer which is
Heterojunction
257194, 257195, 257257, 257294, 257275, H01L 310232, H01L 310304, H01L 310224, H01L 31112
Patent
active
059144971
ABSTRACT:
A tunable antenna-coupled intersubband terahertz (TACIT) detector is based on intersubband absorption in doped semiconductor quantum wells. THz-frequency radiation impinges on a coplanar antenna. The antenna couples radiation into a narrow constriction in a two dimensional electron gas (the "active region") with electric field perpendicular to the plane of the antenna. Radiation, which is at the intersubband absorption frequency, is absorbed in the active region. The resulting change in resistance through the constriction is detected. The frequency of the absorption, and hence the detection frequency, can be tuned over the 1-5 THz range by applying small voltages between a front and back gate. The efficiency with which radiation couples from the antenna into the active region can be optimized at each frequency.
TACIT detectors solve a number of outstanding problems associated with Terahertz detection including:
REFERENCES:
patent: 4814836 (1989-03-01), Thompson
patent: 5459343 (1995-10-01), Seymour et al.
patent: 5640026 (1997-06-01), Terazono
Dawes Daniel L.
Jackson, Jr. Jerome
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