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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 5 — Mar. 1, 2010
  • pp: 4518–4525

Sub-wavelength focal spot with long depth of focus generated by radially polarized, narrow-width annular beam

Kyoko Kitamura, Kyosuke Sakai, and Susumu Noda  »View Author Affiliations


Optics Express, Vol. 18, Issue 5, pp. 4518-4525 (2010)
http://dx.doi.org/10.1364/OE.18.004518


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Abstract

We demonstrate the formation of a sub-wavelength focal spot with a long depth of focus using a radially polarized, narrow-width annular beam. Theoretical analysis predicts that a tighter focal spot (approximately 0.4λ) and longer depth of focus (more than 4λ) can be formed by a longitudinal electric field when the width of the annular part of the beam is decreased. Experimental measurements using a radially polarized beam from a photonic crystal laser agree well with these predictions. Tight focal spots with long depths of focus have great potential for use in high-tolerance, high-resolution applications in optical systems.

© 2010 OSA

OCIS Codes
(260.1960) Physical optics : Diffraction theory
(260.5430) Physical optics : Polarization

ToC Category:
Physical Optics

History
Original Manuscript: November 25, 2009
Revised Manuscript: January 20, 2010
Manuscript Accepted: February 9, 2010
Published: February 19, 2010

Citation
Kyoko Kitamura, Kyosuke Sakai, and Susumu Noda, "Sub-wavelength focal spot with long depth of focus generated by radially polarized, narrow-width annular beam," Opt. Express 18, 4518-4525 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-5-4518


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