Spatial sampling of terahertz fields with subwavelength accuracy via probe beam encoding

Jiapeng Zhao; Yiwen E.; Kaia Williams; X.-C. Zhang; Robert W. Boyd

doi:10.1117/12.2547156

2 March 2020 Spatial sampling of terahertz fields with subwavelength accuracy via probe beam encoding

Jiapeng Zhao, Yiwen E., Kaia Williams, X.-C. Zhang, Robert W. Boyd

Proceedings Volume 11279, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII; 112790I (2020) https://doi.org/10.1117/12.2547156
Event: SPIE OPTO, 2020, San Francisco, California, United States

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.

Conference Presentation

Citation Download Citation

Jiapeng Zhao, Yiwen E., Kaia Williams, X.-C. Zhang, and Robert W. Boyd "Spatial sampling of terahertz fields with subwavelength accuracy via probe beam encoding", Proc. SPIE 11279, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII, 112790I (2 March 2020); https://doi.org/10.1117/12.2547156

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