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Innovative Technologies for THz Heterodyne Detection

Authors:
T.G. Phillips
Abstract:
The "state-of-the-art" in the field of heterodyne receivers approaches (within a factor of a few) the quantum noise limit, for frequencies up to about 700 GHz, the bandgap of niobium. Such receivers use the SIS structure and the physics of photon assisted single quasi-particle tunneling. IF bandwidths are as large as 25 GHz. Above 700 GHz various loss mechanisms set in and above about 1.4 THz HEB devices are preferred, even though the IF bandwidth is usually only a few GHz. For the future, at frequencies <1 THz, improvement will probably be in the area of increased IF bandwidth and in the area of focal plane arrays, demanding large LO powers. At frequencies well into the THz range quantum noise is dominant and the receiver noise figure should not be a problem. However, constructing tuneable local oscillators with sufficient power becomes the problem. This talk will discuss possible solutions to this problem.
Categories:
Backends, Receivers
Year:
2008
Session:
6
Full-text:
Download a PDF of this paper.
Page Number(s):
160-162