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Optics Letters

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  • Vol. 29, Iss. 12 — Jun. 15, 2004
  • pp: 1318–1320

High-numerical-aperture focusing of radially polarized doughnut beams with a parabolic mirror and a flat diffractive lens

Nir Davidson and Nándor Bokor  »View Author Affiliations


Optics Letters, Vol. 29, Issue 12, pp. 1318-1320 (2004)
http://dx.doi.org/10.1364/OL.29.001318


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Abstract

Recently, Dorn et al. [Phys. Rev. Lett. 91, 233901 (2003)] demonstrated the significance of radially polarized doughnut beams in obtaining very small focal spots (with an area of ~0.26λ2) with high-numerical-aperture (NA) aplanatic microscope objectives. We propose two simple alternative ways to focus such radially polarized beams: a parabolic mirror and a flat diffractive lens. Because of their large apodization factor for a high NA, a significant further reduction in spot area (up to a factor of 1.76 at a NA of 1) compared with the aplanatic system can be achieved.

© 2004 Optical Society of America

OCIS Codes
(050.1960) Diffraction and gratings : Diffraction theory
(220.2560) Optical design and fabrication : Propagating methods

Citation
Nir Davidson and Nándor Bokor, "High-numerical-aperture focusing of radially polarized doughnut beams with a parabolic mirror and a flat diffractive lens," Opt. Lett. 29, 1318-1320 (2004)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-29-12-1318


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References

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