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Proceedings Paper

Fourier imaging with CW terahertz waves
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Paper Abstract

Coherent imaging is a well-established technique in the THz range, in this paper we explore the coherent continuous-wave (CW) THz imaging by recording the complex-valued spatial Fourier spectrum in the focal plane of the imaging system, and by utilizing the Fast Fourier Transform (FFT) technique to numerically retrieve both the intensity and the phase information of the object. System is built up based on the heterodyne detection consisting of two electric multiplier chain locked to each other with a slightly frequency off-set and a narrow-band CMOS TeraFET detector, aiming at the recording and reconstruction of 2D and 3D scenes. With a detection area of 80×70mm2 and a sampling rate of 1pixel/mm2 , both 7.6-cm-diameter 2D intensity image and 3D tomography extracted from the phase information of the object are reconstructed, which also reveals the system a capability of covering a large field of view (FOV).

Paper Details

Date Published: 6 September 2019
PDF: 6 pages
Proc. SPIE 11124, Terahertz Emitters, Receivers, and Applications X, 1112411 (6 September 2019); doi: 10.1117/12.2528661
Show Author Affiliations
Hui Yuan, Physikalisches Institut, Goethe-Univ. Frankfurt am Main (Germany)
Daniel Voß, Physikalisches Institut, Goethe-Univ. Frankfurt am Main (Germany)
Continental Automotive GmbH (Germany)
Alvydas Lisauskas, Vilnius Univ. (Lithuania)
CENTERA (Poland)
Fen Li, School of Optics and Photonics, Beijing Institute of Technology (China)
Hartmut G. Roskos, Goethe-Univ. Frankfurt am Main (Germany)

Published in SPIE Proceedings Vol. 11124:
Terahertz Emitters, Receivers, and Applications X
Manijeh Razeghi; Alexei N. Baranov; Miriam S. Vitiello, Editor(s)

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