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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 25 — Dec. 16, 2013
  • pp: 30444–30452

Achievement of needle-like focus by engineering radial-variant vector fields

Bing Gu, Jia-Lu Wu, Yang Pan, and Yiping Cui  »View Author Affiliations

Optics Express, Vol. 21, Issue 25, pp. 30444-30452 (2013)

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We present and demonstrate a novel method for engineering the radial-variant polarization on the incident field to achieve a needle of transversally polarized field without any pupil filters. We generate a new kind of localized linearly-polarized vector fields with distributions of states of polarization (SoPs) describing by the radius to the power p and explore its tight focusing, nonparaxial focusing, and paraxial focusing properties. By tuning the power p, we obtain the needle-like focal field with hybrid SoPs and give the formula for describing the length of the needle. Experimentally, we systematically investigate both the intensity distributions and the polarization evolution of the optical needle by paraxial focusing the generated vector field. Such an optical needle, which enhances the light-matter interaction, has intriguing applications in optical microma-chining and nonlinear optics.

© 2013 Optical Society of America

OCIS Codes
(230.6120) Optical devices : Spatial light modulators
(260.1960) Physical optics : Diffraction theory
(260.5430) Physical optics : Polarization

ToC Category:
Physical Optics

Original Manuscript: September 5, 2013
Revised Manuscript: October 16, 2013
Manuscript Accepted: November 19, 2013
Published: December 4, 2013

Bing Gu, Jia-Lu Wu, Yang Pan, and Yiping Cui, "Achievement of needle-like focus by engineering radial-variant vector fields," Opt. Express 21, 30444-30452 (2013)

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