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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 14 — Jul. 5, 2010
  • pp: 14762–14767

Near-field nanofocusing through a combination of plasmonic Bragg reflector and converging lens

Wentao Song, Zheyu Fang, Shan Huang, Feng Lin, and Xing Zhu  »View Author Affiliations

Optics Express, Vol. 18, Issue 14, pp. 14762-14767 (2010)

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We report the near-field nanofocusing through a plasmonic lens containing a Bragg reflector and a converging lens, which consist of semitransparent annular grooves milled into a gold film with different periods along the radial direction. By illuminating the structure with a linearly polarized light, two tightly focal spots were detected by scanning near-field optical microscope. This plasmonic lens has considerably reduced direct light transmission, making the focal spots obvious. By raising the radius of half of every groove, one single spot was obtained. Furthermore, theoretical simulations prove that the light intensity of the focal spots can be doubled through adding the Bragg reflector surrounding the converging lens.

© 2010 OSA

OCIS Codes
(240.0240) Optics at surfaces : Optics at surfaces
(240.6680) Optics at surfaces : Surface plasmons
(180.4243) Microscopy : Near-field microscopy

ToC Category:
Optics at Surfaces

Original Manuscript: April 23, 2010
Revised Manuscript: May 21, 2010
Manuscript Accepted: June 8, 2010
Published: June 25, 2010

Wentao Song, Zheyu Fang, Shan Huang, Feng Lin, and Xing Zhu, "Near-field nanofocusing through a combination of plasmonic Bragg reflector and converging lens," Opt. Express 18, 14762-14767 (2010)

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