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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 22 — Nov. 4, 2013
  • pp: 27509–27518

Nonlocal propagation and tunnelling of surface plasmons in metallic hourglass waveguides

Aeneas Wiener, Antonio I. Fernández-Domínguez, J. B. Pendry, Andrew P. Horsfield, and Stefan A. Maier  »View Author Affiliations


Optics Express, Vol. 21, Issue 22, pp. 27509-27518 (2013)
http://dx.doi.org/10.1364/OE.21.027509


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Abstract

The nanofocusing performance of hourglass plasmonic waveguides is studied analytically and numerically. Nonlocal effects in the linearly tapered metal-air-metal stack that makes up the device are taken into account within a hydrodynamical approach. Using this hourglass waveguide as a model structure, we show that spatial dispersion drastically modifies the propagation of surface plasmons in metal voids, such as those generated between touching particles. Specifically, we investigate how nonlocal corrections limit the enormous field enhancements predicted by local electromagnetic treatments of geometric singularities. Finally, our results also indicate the emergence of nonlocality assisted tunnelling of plasmonic modes across hourglass contacts as thick as 0.5 nm.

© 2013 OSA

OCIS Codes
(230.7400) Optical devices : Waveguides, slab
(240.7040) Optics at surfaces : Tunneling
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Plasmonics

History
Original Manuscript: September 5, 2013
Revised Manuscript: October 1, 2013
Manuscript Accepted: October 4, 2013
Published: November 4, 2013

Virtual Issues
Surface Plasmon Photonics (2013) Optics Express

Citation
Aeneas Wiener, Antonio I. Fernández-Domínguez, J. B. Pendry, Andrew P. Horsfield, and Stefan A. Maier, "Nonlocal propagation and tunnelling of surface plasmons in metallic hourglass waveguides," Opt. Express 21, 27509-27518 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-22-27509


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