Abstract

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

Computed tomography using broadband Bessel THz beams and phase contrast

Assaf Bitman, Sharone Goldring, Inon Moshe, and Zeev Zalevsky
Opt. Lett. 39(7) 1925-1928 (2014)

Generation of nondiffracting Bessel beam using digital micromirror device

Lei Gong, Yu-Xuan Ren, Guo-Sheng Xue, Qian-Chang Wang, Jin-Hua Zhou, Min-Cheng Zhong, Zi-Qiang Wang, and Yin-Mei Li
Appl. Opt. 52(19) 4566-4575 (2013)

Solid immersion axicon: maximizing nondiffracting or Bessel beam resolution

Ilya Golub
Opt. Lett. 32(15) 2161-2163 (2007)

Surface nanoprocessing with nondiffracting femtosecond Bessel beams

F. Courvoisier, P.-A. Lacourt, M. Jacquot, M. K. Bhuyan, L. Furfaro, and J. M. Dudley
Opt. Lett. 34(20) 3163-3165 (2009)

Highly compact imaging using Bessel beams generated by ultraminiaturized multi-micro-axicon systems

Niklas Weber, Dominik Spether, Andreas Seifert, and Hans Zappe
J. Opt. Soc. Am. A 29(5) 808-816 (2012)