Fourier imaging with CW terahertz waves

Hui Yuan; Daniel Voß; Alvydas Lisauskas; Fen Li; Hartmut G. Roskos

doi:10.1117/12.2528661

6 September 2019 Fourier imaging with CW terahertz waves

Hui Yuan, Daniel Voß, Alvydas Lisauskas, Fen Li, Hartmut G. Roskos

Proceedings Volume 11124, Terahertz Emitters, Receivers, and Applications X; 1112411 (2019) https://doi.org/10.1117/12.2528661
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

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).

Citation Download Citation

Hui Yuan, Daniel Voß, Alvydas Lisauskas, Fen Li, and Hartmut G. Roskos "Fourier imaging with CW terahertz waves", Proc. SPIE 11124, Terahertz Emitters, Receivers, and Applications X, 1112411 (6 September 2019); https://doi.org/10.1117/12.2528661

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