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Proceedings Paper

Spatial sampling of terahertz fields with subwavelength accuracy via probe beam encoding
Author(s): Jiapeng Zhao; Yiwen E.; Kaia Williams; X.-C. Zhang; Robert W. Boyd
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Paper Abstract

Computational sampling methods have been implemented to spatially characterize terahertz (THz) fields. Previous methods usually rely on either specialized THz devices such as THz spatial light modulators, or complicated systems requiring assistance from photon-excited free-carriers with high-speed synchronization among multiple optical beams. Here, by spatially encoding an 800 nm near-infrared (NIR) probe beam through the use of an optical SLM, we demonstrate a simple sampling approach that can probe THz fields with a single-pixel camera. This design does not require any dedicated THz devices, semiconductors or nanofilms to modulate THz fields. By using computational algorithms, we successfully measure 128×128 field distributions with a 62 μm transverse spatial resolution, more than 15 times smaller than the central wavelength of the THz signal (940 μm. Benefiting from the non-invasive nature of THz radiation and sub-wavelength resolution of our system, this simple approach can be used in applications such as biomedical sensing, inspection of flaws in industrial products, and so on.

Paper Details

Date Published: 2 March 2020
PDF: 8 pages
Proc. SPIE 11279, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII, 112790I (2 March 2020); doi: 10.1117/12.2547156
Show Author Affiliations
Jiapeng Zhao, The Institute of Optics, Univ. of Rochester (United States)
Yiwen E., The Institute of Optics, Univ. of Rochester (United States)
Kaia Williams, The Institute of Optics, Univ. of Rochester (United States)
X.-C. Zhang, The Institute of Optics, Univ. of Rochester (United States)
Robert W. Boyd, The Institute of Optics, Univ. of Rochester (United States)
Univ. of Ottawa (Canada)


Published in SPIE Proceedings Vol. 11279:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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