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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 27, Iss. 10 — Oct. 1, 2010
  • pp: 1991–1997

Modeling the sharp focus of a radially polarized laser mode using a conical and a binary microaxicon

V. V. Kotlyar and S. S. Stafeev  »View Author Affiliations


JOSA B, Vol. 27, Issue 10, pp. 1991-1997 (2010)
http://dx.doi.org/10.1364/JOSAB.27.001991


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Abstract

Based on the radial finite-difference time domain method we numerically show that the illumination of a conical glass microaxicon of base radius 7 μ m and height 6 μ m (numerical aperture NA = 0.6 ) by a radially polarized annular R-TEM 01 laser mode of wavelength λ = 1 μ m produces, 20 nm apart from the cone apex, a sharp focus of transverse diameter FWHM = 0.30 λ and longitudinal (axial) width FWHM z = 0.08 λ . The focal spot area at half-maximum intensity is HMA = 0.071 λ 2 . For comparison the focus diameter reported here is 1.7 times smaller than the diameter of the minimal diffraction spot (Airy disk, NA = 1 ) of FWHM = 0.51 λ , with its area being 2.87 times smaller than that of the Airy disk HMA = 0.204 λ 2 . Also it is smaller than the diameter of a focal spot formed by a lens with NA = 0.6 in an immersion medium n = 1.5 , FWHM = 0.51 λ / n   NA = 0.55 λ , smaller than the diffraction limit in the medium ( n = 1.5 , NA = 1 ) FWHM = 0.51 λ / n = 0.33 λ and smaller than the focusing limit for the Bessel beam ( NA = 1 ) FWHM = 0.36 λ .

© 2010 Optical Society of America

OCIS Codes
(230.3990) Optical devices : Micro-optical devices
(240.6690) Optics at surfaces : Surface waves

ToC Category:
Optics at Surfaces

History
Original Manuscript: June 11, 2010
Manuscript Accepted: July 18, 2010
Published: September 15, 2010

Citation
V. V. Kotlyar and S. S. Stafeev, "Modeling the sharp focus of a radially polarized laser mode using a conical and a binary microaxicon," J. Opt. Soc. Am. B 27, 1991-1997 (2010)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-27-10-1991

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