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Optics Express

Optics Express

  • Editor: J. H. Eberly
  • Vol. 7, Iss. 10 — Nov. 6, 2000
  • pp: 329–335

Plasmon-polariton modes guided by a metal film of finite width bounded by different dielectrics

Pierre Berini  »View Author Affiliations

Optics Express, Vol. 7, Issue 10, pp. 329-335 (2000)

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The properties of some purely bound plasmon-polariton modes guided by an asymmetric waveguide structure composed of a thin lossy metal film of finite width supported by a dielectric substrate and covered by a different dielectric superstrate are presented for what is believed to be the first time. The mode spectrum supported by these structures is quite different from the spectrum supported by corresponding asymmetric slab structures or similar finite-width symmetric waveguides. Unlike these limiting cases, the dispersion with film thickness exhibits an unusual oscillatory character that is explained by a “switching” of constituent interface modes. This mode switching is unique to asymmetric finite-width structures. Above a certain cut-off film thickness, the structure can support a long-ranging mode and its attenuation decreases very rapidly with decreasing film thickness, more so than the long-ranging mode in symmetric structures. Also, the cutoff thickness of the long-ranging mode is larger than the cutoff thickness of the long-ranging mode in the corresponding asymmetric slab waveguide, which implies that propagation along finite-width films is more sensitive to the asymmetry in the structure than propagation along a similar slab structure. Both of these results are potentially useful for the transmission and control of optical radiation.

© Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Research Papers

Original Manuscript: October 4, 2000
Published: November 6, 2000

Pierre Berini, "Plasmon-polariton modes guided by a metal film of finite width bounded by different dielectrics," Opt. Express 7, 329-335 (2000)

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  2. J. J. Burke, G. I. Stegeman and T. Tamir, "Surface-Polariton-Like Waves Guided by Thin, Lossy Metal Films," Phys.Rev.B 33, 5186-5201 (1986). [CrossRef]
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  5. R. Charbonneau, P. Berini, E. Berolo and E. Lisicka-Shrzek, "Experimental observation of plasmon-polariton waves supported by a thin metal film of finite width," Opt. Lett. 25, 844-846 (2000). [CrossRef]
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