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Focus free terahertz reflection imaging and tomography with Bessel beams

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Abstract

A broadband terahertz (THz) reflection imaging system with high spatial resolution over a large depth of field is reported. A THz axicon lens producing a truncated THz Bessel beam with a linear focus exceeding 120 mm in length, and with the diameter of the central lobe less than 2 mm was used for imaging in a reflection geometry employing a pulsed THz time-domain spectrometer. With numerical post-processing, it was possible to reconstruct the three dimensional shape of the scanned object.

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Acknowledgement

The authors would like to thank Thorsten Probst for helpful discussions and suggestions.

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Authors and Affiliations

  1. Department of Physics, Philipps-Universität Marburg, 35032, Marburg, Germany

    S. F. Busch & M. Koch

  2. Department of Engineering, Macquarie University, North Ryde, 2109, Australia

    G. E. Town

  3. College of Optical Sciences, University of Arizona, Tucson, AZ, 85721, USA

    M. Scheller

Authors
  1. S. F. Busch
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  2. G. E. Town
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  3. M. Scheller
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  4. M. Koch
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Correspondence to S. F. Busch.

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Busch, S.F., Town, G.E., Scheller, M. et al. Focus free terahertz reflection imaging and tomography with Bessel beams. J Infrared Milli Terahz Waves 36, 318–326 (2015). https://doi.org/10.1007/s10762-014-0129-1

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  • DOI: https://doi.org/10.1007/s10762-014-0129-1

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