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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 14 — Jul. 14, 2014
  • pp: 16686–16693

Plasmonic focusing in spiral nanostructures under linearly polarized illumination

Jie Li, Chaojie Yang, Huabo Zhao, Feng Lin, and Xing Zhu  »View Author Affiliations

Optics Express, Vol. 22, Issue 14, pp. 16686-16693 (2014)

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We have investigated the focusing properties of nanostructured plasmonic spiral lens by using linearly polarized illumination, and analysed its field enhancement effect based on the phase matching theory and finite-difference time-domain simulation. We demonstrate that under linearly polarized illumination, spiral plasmonic lens shows focusing property regardless its polarization directions, and the focal spot is about 250nm when the incident wavelength is 671nm. The intensity of the focal spot could also be controlled by altering the radius, the number of turns and the width of the nanostructured spiral slot which are confirmed by finite-difference time-domain simulation.

© 2014 Optical Society of America

OCIS Codes
(170.5810) Medical optics and biotechnology : Scanning microscopy
(240.6680) Optics at surfaces : Surface plasmons
(260.5430) Physical optics : Polarization

ToC Category:

Original Manuscript: March 31, 2014
Revised Manuscript: May 30, 2014
Manuscript Accepted: June 16, 2014
Published: June 30, 2014

Jie Li, Chaojie Yang, Huabo Zhao, Feng Lin, and Xing Zhu, "Plasmonic focusing in spiral nanostructures under linearly polarized illumination," Opt. Express 22, 16686-16693 (2014)

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