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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 20, Iss. 4 — Apr. 1, 2003
  • pp: 633–647

Homogenization expansion for resonances of microstructured photonic waveguides

Steven E. Golowich and Michael I. Weinstein  »View Author Affiliations

JOSA B, Vol. 20, Issue 4, pp. 633-647 (2003)

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We develop a homogenization expansion approach to photonic waveguides whose transverse structures are N-fold rotationally symmetric. Examples include microstructured or holey optical fibers with air holes arranged in one or more concentric rings. We carry out a homogenization expansion for large N about the N=∞ limit. Our multiple scale analysis applies to the scalar approximation of structures in which the microfeatures have arbitrary geometry and large index contrasts and lead to a natural efficient computational algorithm for the waveguide modes and spectral characteristics. In this paper we focus on structures that possess leaky modes. The leading order (N=∞) equations describe the modes of an averaged structure. We derive an expansion in powers of 1/N of corrections to the leading order behavior and show that the leading order nontrivial contribution arises at order 1/N2. We numerically calculate this leading order correction to the complex effective indices (scattering resonances) for the leaky modes of various microstructured photonic waveguides whose imaginary parts give the leakage rates. We observe that in many instances a two-term truncation of the homogenization expansion gives good agreement with full simulations, even for fairly small values of N, whereas the leading order (averaged) theory yields a substantial underestimate of the leakage rates.

© 2003 Optical Society of America

OCIS Codes
(000.3860) General : Mathematical methods in physics
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2400) Fiber optics and optical communications : Fiber properties

Steven E. Golowich and Michael I. Weinstein, "Homogenization expansion for resonances of microstructured photonic waveguides," J. Opt. Soc. Am. B 20, 633-647 (2003)

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