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On the effective medium theory of subwavelength periodic structures

Lalanne, Philippe, Lemercier-lalanne, Dominique·1996·Journal of Modern Optics

Abstract

The effective medium theory of one-dimensional and two-dimensional periodic structures are investigated. A method based on a Fourier decomposition of the wave propagating along the direction perpendicular to the periodic structures allows one to determine the zeroth-, first- and second-order effective indices. For one-dimensional problems, we derive closed-form expressions of the effective indices for both TE and TM polarization. Our result can be applied to arbitrary periodic structure with symmetric or non-symmetric lamellar or continuously varying index profiles. The theoretical predictions are carefully validated using rigorous coupled-wave analysis. For the two-dimensional case, only symmetric structures are discussed and the computation of the zeroth-, first-, and second-order effective indices requires the inversion of an infinite matrix which can be truncated and simply solved numerically. The EMT prediction is qualitatively validated using rigorous computation for small period-to-wavelength ratios. It is shown that for large period-to-wavelength ratios near the cutoff value, no analogy between 2-D periodic structures and homogeneous media holds for highly modulated lamellar gratings.

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Metadata

Authors
Lalanne, P., & Lemercier-lalanne, D.
Venue
Journal of Modern Optics
Published
1996-10
Volume
43
Issue
10
Pages
2063-2085
ISSN
  • 0950-0340 (ISSN-L)
  • 1362-3044
OpenAlex
W2056893961
Cited by
296
References
16
FWCI
4.93
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: On the effective medium theory of subwavelength periodic structures. https://app.cochat.ai/papers/10.1080/09500349608232871
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Lalanne, P., & Lemercier-lalanne, D. (1996). On the effective medium theory of subwavelength periodic structures. Journal of Modern Optics. https://doi.org/10.1080/09500349608232871

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