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Publication Citation: Terahertz imaging and spectroscopy based on hot electron bolometer (HEB) heterodyne detection

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Author(s): Eyal Gerecht; Lixing You;
Title: Terahertz imaging and spectroscopy based on hot electron bolometer (HEB) heterodyne detection
Published: January 23, 2008
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, and because of their shorter wavelengths, they offer higher spatial resolution than 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 noise equivalent temperature difference (NEDT) 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.
Conference: SPIE Photonics West
Pages: pp. 1 - 8
Location: San Jose, CA
Dates: January 19-24, 2007
Keywords: focal plane arrays;heterodyne detectors;hot electron bolometers;quasi-optical systems;superconducting devices;terahertz imaging;terahertz receivers;terahertz spectroscopy
Research Areas: Law Enforcement, Electromagnetics
PDF version: PDF Document Click here to retrieve PDF version of paper (276KB)