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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 25 — Dec. 10, 2007
  • pp: 16852–16859

Electric field enhancing properties of the V-shaped optical resonant antennas

Jing Yang, Jiasen Zhang, Xiaofei Wu, and Qihuang Gong  »View Author Affiliations

Optics Express, Vol. 15, Issue 25, pp. 16852-16859 (2007)

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The electric field enhancing properties of the V-shaped optical resonant antenna are studied by using finite-difference time-domain method. Both dipolar and quadrupolar modes can be effectively excited and strong electric field enhancement in the gap of the V-shaped antenna is found. Compared with full-wave dipole antenna, the V-shaped antenna has a greater electric field enhancement, which can be attributed to the higher radiation directivity and the smaller curvature radius of the antenna arms. The more asymmetrical structure also contributes to the efficient quadrupolar excitation. The electric field enhancement of the V-shaped antenna has different dependences on the open angle of the V-shaped antenna for the dipolar and quadrupolar excitation. We obtained stronger electric field enhancing properties by using V-shaped bow-tie antennas, especially for the quadrupolar excitation. The V-shaped antenna and the bow-tie antenna can realize strongly localized and enhanced field and thus are well suitable for the use of near-field optics applications.

© 2007 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(260.5740) Physical optics : Resonance

ToC Category:
Optics at Surfaces

Original Manuscript: October 29, 2007
Revised Manuscript: December 1, 2007
Manuscript Accepted: December 3, 2007
Published: December 4, 2007

Jiasen Zhang, Jing Yang, Xiaofei Wu, and Qihuang Gong, "Electric field enhancing properties of the V-shaped optical resonant antennas," Opt. Express 15, 16852-16859 (2007)

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