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Optics Letters

Optics Letters


  • Vol. 28, Iss. 2 — Jan. 15, 2003
  • pp: 99–101

Ultrasmall focusing spot with a long depth of focus based on polarization and phase modulation

Ching-Cherng Sun and Chin-Ku Liu  »View Author Affiliations

Optics Letters, Vol. 28, Issue 2, pp. 99-101 (2003)

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A design for focusing an incoming light into an ultrasmall spot with a long depth of focus is proposed. We use a phase plate with three concentric regions to modulate the incoming light from radial polarization into outward–inward–outward polarization. The analysis shows that the design is more suitable for a lens with a high numerical aperture because much energy is concentrated in the main lobe of the focus spot.

© 2003 Optical Society of America

OCIS Codes
(050.1380) Diffraction and gratings : Binary optics
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(210.4680) Optical data storage : Optical memories
(260.5430) Physical optics : Polarization

Ching-Cherng Sun and Chin-Ku Liu, "Ultrasmall focusing spot with a long depth of focus based on polarization and phase modulation," Opt. Lett. 28, 99-101 (2003)

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  1. S. Quabis, R. Dorn, M. Eberler, O. Glöckl, and G. Leuchs, Opt. Commun. 179, 1 (2000).
  2. G. Yang, Opt. Commun. 159, 19 (1999).
  3. L. E. Helseth, Opt. Commun. 191, 161 (2001).
  4. B. Richards and E. Wolf, Proc. R. Soc. A 253, 358 (1959).
  5. J. J. Stamnes, Waves in Focal Regions (Hilger, London, 1986).

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