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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 13 — Jun. 20, 2011
  • pp: 12342–12347

Superfocusing of electric or magnetic fields using conical metal tips: effect of mode symmetry on the plasmon excitation method

Jae Sung Lee, Sanghoon Han, Javid Shirdel, Sukmo Koo, Diyar Sadiq, Christoph Lienau, and Namkyoo Park  »View Author Affiliations

Optics Express, Vol. 19, Issue 13, pp. 12342-12347 (2011)

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We compare single- and double-sided excitation methods of adiabatic surface plasmon polariton (SPP) wave superfocusing for scattering-type metallic near-field scanning optical microscopy (s-NSOM). Using the results of full 3D finite difference time domain analyses, the differences in field enhancement factors are explained and reveal the mode selectivity of a conical NSOM tip for adiabatic SPP superfocusing. Exploiting the mode-symmetric nature of the tip further, we also show that it is possible to selectively confine either the electric or magnetic field at the NSOM tip apex, by simply adjusting the relative phase between the SPP waves in the double-sided excitation approach.

© 2011 OSA

OCIS Codes
(230.3810) Optical devices : Magneto-optic systems
(240.6680) Optics at surfaces : Surface plasmons
(180.4243) Microscopy : Near-field microscopy

ToC Category:

Original Manuscript: April 22, 2011
Revised Manuscript: May 28, 2011
Manuscript Accepted: May 31, 2011
Published: June 9, 2011

Jae Sung Lee, Sanghoon Han, Javid Shirdel, Sukmo Koo, Diyar Sadiq, Christoph Lienau, and Namkyoo Park, "Superfocusing of electric or magnetic fields using conical metal tips: effect of mode symmetry on the plasmon excitation method," Opt. Express 19, 12342-12347 (2011)

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