Spatial sampling of terahertz fields with sub-wavelength accuracy via probe-beam encoding

Jiapeng Zhao; Yiwen E; Kaia Williams; Xi-Cheng Zhang; Robert W. Boyd

doi:10.1038/s41377-019-0166-6

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Spatial sampling of terahertz fields with sub-wavelength accuracy via probe-beam encoding

Article

- Spatial sampling of terahertz fields with sub-wavelength accuracy via probe-beam encoding
- Light: Science & Applications Vol. 8, Issue 4, Pages: 519-526(2019)
- Affiliations：
  
  1.The Institute of Optics, University of Rochester, Rochester, NY 14627, USA
  2.Department of Physics, University of Ottawa, Ottawa, ON K1N 6N5, Canada
- Author bio：
  
  Xi-Cheng Zhang (xi-cheng.zhang@rochester.edu)
  Robert W. Boyd (boydrw@mac.com)
- Funds：
- DOI：10.1038/s41377-019-0166-6
  CLC：
- Published：2019，
  
  Published Online：12 June 2019，
  
  Received：03 February 2019，
  
  Revised：15 May 2019，
  
  Accepted：29 May 2019
- Accepted：
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Zhao, J. P. et al. Spatial sampling of terahertz fields with sub-wavelength accuracy via probe-beam encoding. Light: Science & Applications, 8, 519-526 (2019).
DOI：

Zhao, J. P. et al. Spatial sampling of terahertz fields with sub-wavelength accuracy via probe-beam encoding. Light: Science & Applications, 8, 519-526 (2019). DOI： 10.1038/s41377-019-0166-6.

摘要

Abstract

Recently

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. Using computational algorithms

we successfully measure 128 × 128 field distributions with a 62-μm transverse spatial resolution

which is 15 times smaller than the central wavelength of the THz signal (940 μm). Benefitting 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.

关键词

Keywords

references

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