Focus free terahertz reflection imaging and tomography with Bessel beams

S. F. Busch, G. E. Town, M. Scheller, M. Koch

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)318-326
Number of pages9
JournalJournal of Infrared, Millimeter, and Terahertz Waves
Issue number3
StatePublished - Mar 1 2015


  • axicon
  • depth of field
  • reflection imaging
  • terahertz imaging
  • tomography

ASJC Scopus subject areas

  • Radiation
  • Instrumentation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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