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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 19 — Oct. 1, 2013
  • pp: 3937–3940

Sharper focal spot generated by 4π tight focusing of higher-order Laguerre–Gaussian radially polarized beam

Gui-Yang Chen, Feng Song, and Hui-Tian Wang  »View Author Affiliations

Optics Letters, Vol. 38, Issue 19, pp. 3937-3940 (2013)

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The focal electric fields for a 4π high numerical aperture (NA) focusing system with both the doughnut and higher-order Laguerre–Gaussian (LG) radially polarized (RP) beams are investigated in the case of NA=1, and the full width at half-maximum values of the focal spots are calculated. Compared with the single-lens high NA focusing configuration, a sharper spot, whose size is reduced efficiently in the transverse as well as the axial direction, can be formed. Such size reduction is attributed to not only the destruction interference of the longitudinal component caused by the π phase shift between any two adjacent rings of the incident higher-order LG RP beam coming from one particular direction but also the perfect destruction interference of the radial component formed by the two counter-propagating incident beams.

© 2013 Optical Society of America

OCIS Codes
(050.1960) Diffraction and gratings : Diffraction theory
(180.1790) Microscopy : Confocal microscopy
(260.5430) Physical optics : Polarization

ToC Category:
Physical Optics

Original Manuscript: May 31, 2013
Revised Manuscript: August 29, 2013
Manuscript Accepted: September 2, 2013
Published: September 30, 2013

Gui-Yang Chen, Feng Song, and Hui-Tian Wang, "Sharper focal spot generated by 4π tight focusing of higher-order Laguerre–Gaussian radially polarized beam," Opt. Lett. 38, 3937-3940 (2013)

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