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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 19 — Oct. 1, 2012
  • pp: 4164–4166

Improving depth-of field in broadband THz beams using nondiffractive Bessel beams

Assaf Bitman, Inon Moshe, and Zeev Zalevsky  »View Author Affiliations

Optics Letters, Vol. 37, Issue 19, pp. 4164-4166 (2012)

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We report new results related to imaging using broadband Bessel-like beams at the terahertz (THz) domain that were generated by use of axicons and pulsed THz radiation emitting at a bandwidth 0.1 to 1 THz. Such Bessel-like beams exhibit an invariant line of focus with an extended length compared to Gaussian-beams Rayleigh range, which enables imaging through the extended length. We demonstrate this imaging property using a resolution target illuminated by broadband-THz beams and show an improvement by a factor of 3.5 in imaging depth while using Bessel-like beams over Gaussian beams. Our results highlight the potential in using broadband THz radiation together with nondiffractive Bessel beams to significantly improve spatial separation over deep view.

© 2012 Optical Society of America

OCIS Codes
(220.3630) Optical design and fabrication : Lenses
(110.6795) Imaging systems : Terahertz imaging
(110.6915) Imaging systems : Time imaging
(070.7345) Fourier optics and signal processing : Wave propagation

ToC Category:
Imaging Systems

Original Manuscript: August 6, 2012
Revised Manuscript: September 2, 2012
Manuscript Accepted: September 2, 2012
Published: September 28, 2012

Assaf Bitman, Inon Moshe, and Zeev Zalevsky, "Improving depth-of field in broadband THz beams using nondiffractive Bessel beams," Opt. Lett. 37, 4164-4166 (2012)

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