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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 26 — Dec. 30, 2013
  • pp: 32217–32224

Investigation of electric field enhancement between metal blocks at the focused field generated by a radially polarized beam

Kyoko Kitamura, Ting Ting Xu, and Susumu Noda  »View Author Affiliations

Optics Express, Vol. 21, Issue 26, pp. 32217-32224 (2013)

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A radially polarized beam possesses peculiar focusing properties compared with a linearly polarized beam, for example, the generation of a strong longitudinal field and zero intensity of the Poynting vector on the beam axis. In order to exploit these focusing properties, here we consider a system in which gold metal cubes are arranged along the propagation direction of the beam. An electric field enhancement of more than 20-times can be generated between two gold cubes separated by a distance λ/10 on the optical axis. This is because the energy of a radially polarized beam can propagate even if a metal cube is located on the beam axis, and a longitudinal field generated between the cubes can induce a surface plasmon mode. We show that these results are peculiar properties that cannot be produced with an incident linearly polarized beam. We also show that the beam can generate multiple regions of electrical field enhancement in the propagating direction when multiple metal cubes are arranged on the beam axis.

© 2013 Optical Society of America

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

ToC Category:
Physical Optics

Original Manuscript: September 23, 2013
Revised Manuscript: December 6, 2013
Manuscript Accepted: December 16, 2013
Published: December 19, 2013

Kyoko Kitamura, Ting Ting Xu, and Susumu Noda, "Investigation of electric field enhancement between metal blocks at the focused field generated by a radially polarized beam," Opt. Express 21, 32217-32224 (2013)

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