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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 6,
  • Issue 10,
  • pp. 785-787
  • (2008)

Generation of sub-wavelength and super-resolution longitudinally polarized non-diffraction beam using lens axicon

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Abstract

It is well known that a light spot of sub-wavelength will diverge in all directions. In this letter, A method is presented for generating sub-wavelength (0.44\lambda) longitudinally polarized beam, which propagates without divergence over lengths of about 2\lambda in free space. This is achieved by a high numerical aperture (NA) lens axicon that utilizes spherical aberration to duplicate the performance of an axicon and to create an extended focal line.

© 2008 Chinese Optics Letters

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