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Proceedings Paper

Terahertz imaging and spectroscopy based on hot electron bolometer (HEB) heterodyne detection
Author(s): Eyal Gerecht; Lixing You
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Paper Abstract

Imaging and spectroscopy at terahertz frequencies have great potential for healthcare, plasma diagnostics, 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. Because of their shorter wavelengths, they offer higher spatial resolution than do microwaves or millimeter waves. We are developing hot electron bolometer (HEB) mixer receivers for heterodyne detection at terahertz frequencies. HEB detectors provide unprecedented sensitivity and spectral resolution at terahertz frequencies. We describe the development of a two-pixel focal plane array (FPA) based on HEB technology. Furthermore, we have demonstrated a fully automated, two-dimensional scanning, passive imaging system based on our HEB technology operating at 0.85 THz. Our high spectral resolution terahertz imager has a total system noise equivalent temperature difference (NEΔT) value of better than 0.5 K and a spatial resolution of a few millimeters. HEB technology is becoming the basis for advanced terahertz imaging and spectroscopic technologies for the study of biological and chemical agents over the entire terahertz spectrum.

Paper Details

Date Published: 6 February 2008
PDF: 8 pages
Proc. SPIE 6893, Terahertz Technology and Applications, 689308 (6 February 2008); doi: 10.1117/12.763723
Show Author Affiliations
Eyal Gerecht, National Institute of Standards and Technology (United States)
Lixing You, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 6893:
Terahertz Technology and Applications
Kurt J. Linden; Laurence P. Sadwick, Editor(s)

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