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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 6, Iss. 9 — Oct. 3, 2011

Gap surface plasmon polaritons enhanced by a plasmonic lens

Hyun Chul Kim and Xing Cheng  »View Author Affiliations

Optics Letters, Vol. 36, Issue 16, pp. 3082-3084 (2011)

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We numerically investigate the optical field enhancement based on gap surface plasmon polaritons (GSPPs) that are enhanced by propagating surface waves launched by a circular slit at a metal–dielectric interface. The optical field enhancement originates not only from multiple scattering and coupling of GSPPs in the spacer region between two metal layers but also from propagating surface plasmon polaritons (SPPs) launched by a circular plasmonic lens. We find that the combination of the GSPPs and the propagating SPPs launched by the plasmonic lens can achieve extremely strong field confinement, and we find that the surface-enhanced Raman scattering (SERS) enhancement factor can be up to 10 15 at the tip of the equilateral triangular nanostructures. The structure proposed here is expected to find promising applications where strong field enhancement is desired, such as optical sensing with the SERS effect.

© 2011 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(240.6695) Optics at surfaces : Surface-enhanced Raman scattering

ToC Category:
Optics at Surfaces

Original Manuscript: May 31, 2011
Revised Manuscript: July 9, 2011
Manuscript Accepted: July 13, 2011
Published: August 8, 2011

Virtual Issues
Vol. 6, Iss. 9 Virtual Journal for Biomedical Optics

Hyun Chul Kim and Xing Cheng, "Gap surface plasmon polaritons enhanced by a plasmonic lens," Opt. Lett. 36, 3082-3084 (2011)

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