Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
88 (2000), S. 6801-6807
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
A Nb hot-electron bolometer designed for operation as a sensor of millimeter waves and far-infrared radiation has been analyzed. This optically coupled detector has a very wide spectral bandwidth, a response speed of ∼1 ns determined by electron-phonon scattering, and an impedance of 50 Ω. The geometry employed here has traditionally been affected by stability problems manifesting as random voltage fluctuations, which have hindered the usefulness of these bolometers. This issue has been addressed by exploring the underlying physical causes and adapting the fabrication technique. Analytical results on substrate-induced bolometric effects are summarized and other factors concerning detector performance addressed, and the reality of an isothermal regime of operation is questioned. A noise equivalent power of 4 pW/Hz1/2 was measured at 100 μm, with a coupling efficiency close to unity that was achieved by reducing the optical reflection losses. Operation of a similar device is shown able to resolve the macropulses of FELIX, the Free-Electron Laser for Infrared eXperiments, into its 40 ns spaced micropulses. © 2000 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1320008
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