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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 10 — May. 10, 2010
  • pp: 10822–10827

Focusing of a femtosecond vortex light pulse through a high numerical aperture objective

Baosuan Chen, Jixiong Pu, and Olga Korotkova  »View Author Affiliations


Optics Express, Vol. 18, Issue 10, pp. 10822-10827 (2010)
http://dx.doi.org/10.1364/OE.18.010822


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Abstract

We investigate the focusing properties of a femtosecond vortex light pulse focused by a high numerical aperture objective. By using the Richards-Wolf vectorial diffraction method, the intensity distribution, the velocity variation and the orbital angular momentum near the focus are studied in great detail. We have discovered that the femtosecond vortex light pulse can travel at various speeds, that is, slower or faster than light with a tight focusing system. Moreover, we have found that the numerical aperture of the focusing objective and the duration of the vortex light pulse will influence the orbital angular momentum distribution in the focused field.

© 2010 OSA

OCIS Codes
(050.1960) Diffraction and gratings : Diffraction theory
(320.7120) Ultrafast optics : Ultrafast phenomena
(260.6042) Physical optics : Singular optics

History
Original Manuscript: December 9, 2009
Revised Manuscript: February 20, 2010
Manuscript Accepted: March 17, 2010
Published: May 10, 2010

Virtual Issues
Unconventional Polarization States of Light (2010) Optics Express

Citation
Baosuan Chen, Jixiong Pu, and Olga Korotkova, "Focusing of a femtosecond vortex light pulse through a high numerical aperture objective," Opt. Express 18, 10822-10827 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-10-10822


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