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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 35, Iss. 16 — Aug. 15, 2010
  • pp: 2693–2695

Plasmonic modes of extreme subwavelength nanocavities

Jörg Petschulat, Christian Helgert, Michael Steinert, Norbert Bergner, Carsten Rockstuhl, Falk Lederer, Thomas Pertsch, Andreas Tünnermann, and Ernst-Bernhard Kley  »View Author Affiliations


Optics Letters, Vol. 35, Issue 16, pp. 2693-2695 (2010)
http://dx.doi.org/10.1364/OL.35.002693


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Abstract

We study the physics of a new type of subwavelength nanocavities. They are based on U-shaped metal–insulator–metal waveguides supporting the excitation of surface plasmon polaritons. The nanocavity arrays are excited by plane waves at either a normal or oblique incidence. Because of their finite length, discrete modes emerge within the nanocavity. We show that the excitation symmetry with respect to the cavity ends permits the observation of even and odd modes. Our investigations include near- and far-field simulations and predict a strong spectral far-field response of the comparably small nanoresonators. The strong near-field enhancement observed in the cavity at resonance might be suitable to increase the efficiency of nonlinear optical effects and quantum analogies and might facilitate the development of optical elements, such as active plasmonic devices.

© 2010 Optical Society of America

OCIS Codes
(160.4236) Materials : Nanomaterials
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Materials

History
Original Manuscript: July 8, 2010
Manuscript Accepted: July 9, 2010
Published: August 6, 2010

Citation
Jörg Petschulat, Christian Helgert, Michael Steinert, Norbert Bergner, Carsten Rockstuhl, Falk Lederer, Thomas Pertsch, Andreas Tünnermann, and Ernst-Bernhard Kley, "Plasmonic modes of extreme subwavelength nanocavities," Opt. Lett. 35, 2693-2695 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-16-2693

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