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Proceedings Paper

Imaging and spectroscopy at terahertz frequencies using hot electron bolometer technology
Author(s): Eyal Gerecht; Dazhen Gu; Fernando Rodriguez-Morales; Sigfrid Yngvesson
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Paper Abstract

Imaging and spectroscopy at terahertz frequencies (defined roughly as 300 GHz - 3 THz) have great potential for both healthcare and homeland security applications. Terahertz frequencies correspond to energy level transitions of important molecules in biology and astrophysics. Terahertz radiation (T-rays) can penetrate clothing and, to some extent, can also penetrate biological materials, and because of their shorter wavelengths they offer higher spatial resolution than microwaves or millimeter waves. We describe the development of a novel two-dimensional scanning, passive, terahertz imaging system based on a hot electron bolometer (HEB) detector element. HEB mixers are near quantum noise limited heterodyne detectors operating over the entire terahertz spectrum. HEB devices absorb terahertz radiation up to the visible range due to the very short momentum scattering times. The terahertz imaging system consists of a front-end heterodyne detector integrated with a state-of-the-art monolithic microwave integrated-circuit low-noise amplifier (MMIC LNA) on the same mixer block. The terahertz local oscillator (LO) signal is provided by a commercial harmonic multiplier source.

Paper Details

Date Published: 12 October 2006
PDF: 11 pages
Proc. SPIE 6373, Terahertz Physics, Devices, and Systems, 63730L (12 October 2006); doi: 10.1117/12.685413
Show Author Affiliations
Eyal Gerecht, National Institute of Standards and Technology (United States)
Dazhen Gu, National Institute of Standards and Technology (United States)
Fernando Rodriguez-Morales, Univ. of Massachusetts, Amherst (United States)
Sigfrid Yngvesson, Univ. of Massachusetts, Amherst (United States)

Published in SPIE Proceedings Vol. 6373:
Terahertz Physics, Devices, and Systems
Mehdi Anwar; Anthony J. DeMaria; Michael S. Shur, Editor(s)

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