Imaging and Spectroscopy at Terahertz Frequencies Using Hot Electron Bolometer Technology
Eyal Gerecht, Dazhen Gu, Fernando Rodriquez-Morales, Sigfrid Yngvesson
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 ibbiology 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 the fron-end heterodyne detector integrated with the state-of-the-art MMICLNA ont he same mixer block. The terahertz local oscillator (LO) signals is provided by a commercial harmonic multiplier source
SPIE THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING
, Gu, D.
, Rodriquez-Morales, F.
and Yngvesson, S.
Imaging and Spectroscopy at Terahertz Frequencies Using Hot Electron Bolometer Technology, SPIE THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING, Boston, MA, USA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=32450
(Accessed February 26, 2024)