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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 6 — Mar. 25, 2013
  • pp: 6845–6850

Split ring aperture for optical magnetic field enhancement by radially polarized beam

Y. Yang, H. T. Dai, and X. W. Sun  »View Author Affiliations

Optics Express, Vol. 21, Issue 6, pp. 6845-6850 (2013)

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Inspired by Babinet’s principle, we proposed a new plasmonic structure for enhancing the optical magnetic field, i.e. split ring aperture, whose complement is the well-known split ring. The split ring aperture exhibits a much better performance under radially polarized excitation than linearly polarized excitation. We attribute the ultra-high intensity enhancement in magnetic field to the symmetric matching between the aperture geometry and the direction of the electric field vector in each direction of radially excitation. The impact of the design parameters on the intensity enhancement and resonant wavelength is also investigated in details.

© 2013 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(350.4238) Other areas of optics : Nanophotonics and photonic crystals
(250.5403) Optoelectronics : Plasmonics
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optics at Surfaces

Original Manuscript: October 31, 2012
Revised Manuscript: December 29, 2012
Manuscript Accepted: March 4, 2013
Published: March 12, 2013

Y. Yang, H. T. Dai, and X. W. Sun, "Split ring aperture for optical magnetic field enhancement by radially polarized beam," Opt. Express 21, 6845-6850 (2013)

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