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Low-Noise Wide Bandwith, Hot Electron Bolometer Mixers for Submillimeter Wavelengths

Show simple item record McGrath, W. R. en_US 2004-10-04T16:30:49Z 2004-10-04T16:30:49Z 1995-09 en_US
dc.identifier.citation Boulder, Colorado en_US
dc.identifier.clearanceno 95-1316 en_US
dc.description.abstract Recently a novel superconductive hot-electron micro-bolometer has been proposed which is both fast and sensitive (D. E. Prober, Appl. Phys. Lett. 62, 2119, 1993). This device has several important properties which make it useful as a heterodyne sensor for radioastronomy applications at frequencies above 1 THz. The thermal response time of the device is fast enough, several 10's of picoseconds, to allow for IF's of several GHz. This bolometer mixer should operate well up to at least 10 THz. There is no energy gap limitation as in an SIS mixer, since the mixing process relies on heating of the electron gas. In fact, rf power is absorbed more uniformly above the gap frequency. The mixer noise should be near quantum-limited, and the local oscillator (LO) power requirement is very low: ÷ 10 nW for a Nb device. One of the unique features of this device is that it employs rapid electron diffusion into a normal metal, rather than phonon emission, as the thermal conductance that cools the heated electrons. In order for diffusion to dominate over phonon emission, the device must be short, less than 0.5 歮 en_US
dc.format.extent 36707 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.subject.other Bolometer Mixers en_US
dc.title Low-Noise Wide Bandwith, Hot Electron Bolometer Mixers for Submillimeter Wavelengths en_US

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