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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Franco Gori
  • Vol. 27, Iss. 1 — Jan. 1, 2010
  • pp: 85–94

Magnetic field integral equation analysis of surface plasmon scattering by rectangular dielectric channel discontinuities

Ioannis Chremmos  »View Author Affiliations

JOSA A, Vol. 27, Issue 1, pp. 85-94 (2010)

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The scattering of a surface plasmon polariton (SPP) by a rectangular dielectric channel discontinuity is analyzed through a rigorous magnetic field integral equation method. The scattering phenomenon is formulated by means of the magnetic-type scalar integral equation, which is subsequently treated through an entire-domain Galerkin method of moments (MoM), based on a Fourier-series plane wave expansion of the magnetic field inside the discontinuity. The use of Green’s function Fourier transform allows all integrations over the area and along the boundary of the discontinuity to be performed analytically, resulting in a MoM matrix with entries that are expressed as spectral integrals of closed-form expressions. Complex analysis techniques, such as Cauchy’s residue theorem and the saddle-point method, are applied to obtain the amplitudes of the transmitted and reflected SPP modes and the radiated field pattern. Through numerical results, we examine the wavelength selectivity of transmission and reflection against the channel dimensions as well as the sensitivity to changes in the refractive index of the discontinuity, which is useful for sensing applications.

© 2009 Optical Society of America

OCIS Codes
(240.5420) Optics at surfaces : Polaritons
(240.6680) Optics at surfaces : Surface plasmons
(240.6690) Optics at surfaces : Surface waves
(290.5825) Scattering : Scattering theory

ToC Category:
Optics at Surfaces

Original Manuscript: July 28, 2009
Manuscript Accepted: November 9, 2009
Published: December 9, 2009

Ioannis Chremmos, "Magnetic field integral equation analysis of surface plasmon scattering by rectangular dielectric channel discontinuities," J. Opt. Soc. Am. A 27, 85-94 (2010)

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