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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 21 — Oct. 17, 2007
  • pp: 13669–13674

On long-range plasmonic modes in metallic gaps

David F. P. Pile, Dmitri K. Gramotnev, Rupert F. Oulton, and Xiang Zhang  »View Author Affiliations

Optics Express, Vol. 15, Issue 21, pp. 13669-13674 (2007)

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Satuby and Orenstein [Opt. Express 15, 4247–4252 (2007)] reported the discovery and numerical and experimental investigation of long-range surface plasmon-polariton eigenmodes guided by wide (6 to 12 μm) rectangular gaps in 400 nm thick gold films using excitation of vacuum wavelength λ vac = 1.55 μm. In this paper, we carry out a detailed numerical analysis of the two different types of plasmonic modes in these structures. We show that no long-range eigenmodes exists for these gap plasmon waveguides, and that the reported “modes” are likely to be beams of bulk waves and surface plasmons, rather than guided modes of the considered structures.

© 2007 Optical Society of America

OCIS Codes
(230.7370) Optical devices : Waveguides
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Optics at Surfaces

Original Manuscript: July 25, 2007
Revised Manuscript: September 4, 2007
Manuscript Accepted: September 4, 2007
Published: October 4, 2007

David F. P. Pile, Dmitri K. Gramotnev, Rupert F. Oulton, and Xiang Zhang, "On long-range plasmonic modes in metallic gaps," Opt. Express 15, 13669-13674 (2007)

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  1. D. F. P. Pile, T. Ogawa, Y. Matsuzaki, K. C. Vernon, K. Yamaguchi, T. Okamoto, M. Haraguchi, and M. Fukui, "Two-dimensionally localized modes of a nanoscale gap plasmon waveguide," Appl. Phys. Lett. 87, 261114 (2005). [CrossRef]
  2. G. Veronis and S. Fan, "Guided subwavelength plasmonic mode support by a slot in a thin metal film," Opt. Lett. 30, 3359-3361 (2005). [CrossRef]
  3. L. Liu, Z. Han, and S. He, "Novel surface plasmon waveguide for high integration," Opt. Express 13, 6645-6650 (2005). [CrossRef] [PubMed]
  4. D. F. P. Pile and D. K. Gramotnev, "Channel plasmon-polariton in a triangular groove on a metal surface," Opt. Lett. 29, 1069-1071 (2004). [CrossRef] [PubMed]
  5. D. K. Gramotnev and D. F. P. Pile, "Single-mode sub-wavelength waveguide with channel plasmon-polaritons in triangular grooves on a metal surface," Appl. Phys. Lett. 85, 6323-6325 (2004). [CrossRef]
  6. S. I. Bozhevolnyi, V. S. Volkov, E. Devaux, and T. W. Ebbesen, "Channel plasmon-polariton guiding by subwavelength metal grooves," Phys. Rev. Lett. 95, 046802 (2005). [CrossRef] [PubMed]
  7. S. I. Bozhevolnyi, V. S. Volkov, E. Devaux, J.-Y. Laluet, and T. W. Ebbesen, "Channel plasmon sub-wavelength waveguide components including interferometers and ring resonators," Nature 440, 508-511 (2006). [CrossRef] [PubMed]
  8. D. F. P. Pile, D. K. Gramotnev, M. Haraguchi, T. Okamoto, and M. Fukui, "Numerical analysis of coupled wedge plasmons in a structure of two metal wedges separated by a gap," J. Appl. Phys. 100, 013101 (2006). [CrossRef]
  9. P. Berini, "Plasmon-polariton waves guided by thin lossy metal films of finite width: Bound modes of symmetric structures," Phys. Rev. B 61, 10484 (2000). [CrossRef]
  10. D. F. P. Pile, T. Ogawa, D. K. Gramotnev, T. Okamoto, M. Haraguchi, M. Fukui, and S. Matsuo, "Theoretical and experimental investigation of strongly localized plasmons on triangular metal wedges for subwavelength waveguiding," Appl. Phys. Lett. 87, 061106 (2005). [CrossRef]
  11. Y. Satuby and M. Orenstein, "Surface-Plasmon-Polariton modes in deep metallic trenches- measurement and analysis," Opt. Express 15, 4247-4252 (2007). [CrossRef] [PubMed]
  12. D. F. P. Pile, "Compact-2D FDTD for waveguides including materials with negative dielectric permittivity, magnetic permittivity and refractive index," Appl. Phys. B 81, 607-613 (2005). [CrossRef]
  13. Y. Satuby and M. Orenstein, "Surface plasmon poloariton waveguiding: From multimode stripe to a slot geometry," Appl. Phys. Lett. 90, 251104 (2007). [CrossRef]

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