Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

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



Eyal Gerecht, Lixing You


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 Dates
January 19-24, 2007
Conference Location
San Jose, CA
Conference Title
SPIE Photonics West


focal plane arrays, heterodyne detectors, hot electron bolometers, quasi-optical systems, superconducting devices, terahertz imaging, terahertz receivers, terahertz spectroscopy
Created January 23, 2008, Updated February 19, 2017