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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 5 — Feb. 28, 2011
  • pp: 4740–4755

Description of the modes governing the optical transmission through metal gratings

Mickaël Guillaumée, L. Andrea Dunbar, and Ross P. Stanley  »View Author Affiliations

Optics Express, Vol. 19, Issue 5, pp. 4740-4755 (2011)

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An analytical model based on a modal expansion method is developed to investigate the optical transmission through metal gratings. This model gives analytical expressions for the transmission as well as for the dispersion relations of the modes responsible for high transmission. These expressions are accurate even for real metals used in the visible – near-infrared wavelength range, where surface plasmon polaritons (SPP’s) are excited. The dispersion relations allow the nature of the modes to be assessed. We find that the transmission modes are hybrid between Fabry-Pérot like modes and SPP’s. It is also shown that it is important to consider different refractive indices above and below the gratings in order to determine the nature of the hybrid modes. These findings are important as they clarify the nature of the modes responsible for high transmission. It can also be useful as a design tool for metal gratings for various applications.

© 2011 OSA

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Diffraction and Gratings

Original Manuscript: December 9, 2010
Revised Manuscript: January 21, 2011
Manuscript Accepted: February 8, 2011
Published: February 25, 2011

Mickaël Guillaumée, L. Andrea Dunbar, and Ross P. Stanley, "Description of the modes governing the optical transmission through metal gratings," Opt. Express 19, 4740-4755 (2011)

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