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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry van Driel
  • Vol. 29, Iss. 11 — Nov. 1, 2012
  • pp: 3157–3169

Analytical model for metal–insulator–metal mesh waveguide architectures

Charles Lin, Mohamed A. Swillam, and Amr S. Helmy  »View Author Affiliations

JOSA B, Vol. 29, Issue 11, pp. 3157-3169 (2012)

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Metal–insulator–metal (MIM) waveguide mesh structures utilize X-junctions as power distribution elements to create interference and feedback effects, thereby providing rich device functionality. We present a generalized analytical model for MIM mesh structures by incorporating a modified characteristic impedance model for MIM junctions into the scattering matrix formalism. The modified impedance model accounts for metal absorption and provides accurate prediction of plasmonic field distribution at X-junctions in terms of both magnitude and phase. Closed-form expressions for 2×1 and 2×2 MIM mesh architectures as well as MIM stub structures are then obtained and are dependent only on waveguide geometry and junction configuration. The model does not require numerically extracted parameters, and results agree, within a few percent, with those obtained from finite-difference time-domain method for both two-dimensional and three-dimensional waveguide geometries. The capability of the model for efficient design and optimization of junction-based MIM devices is demonstrated through the development of various filter and resonant devices.

© 2012 Optical Society of America

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(240.6680) Optics at surfaces : Surface plasmons
(240.6690) Optics at surfaces : Surface waves
(350.4238) Other areas of optics : Nanophotonics and photonic crystals
(250.5403) Optoelectronics : Plasmonics
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optics at Surfaces

Original Manuscript: May 29, 2012
Revised Manuscript: September 4, 2012
Manuscript Accepted: September 5, 2012
Published: October 29, 2012

Charles Lin, Mohamed A. Swillam, and Amr S. Helmy, "Analytical model for metal–insulator–metal mesh waveguide architectures," J. Opt. Soc. Am. B 29, 3157-3169 (2012)

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