Anomalous effective medium approximation breakdown in deeply subwavelength all-dielectric photonic multilayers

Andrei Andryieuski, Andrei Lavrinenko, Sergei Zhukovsky

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Abstract

We present a comprehensive analysis of the applicability of the effective medium approximation to deeply subwavelength (period ≤λ/50) all-dielectric multilayer structures. We demonstrate that even though the dispersion relations for such multilayers differ from the effective medium prediction only slightly, there can be regimes when an actual multilayer stack exhibits significantly different properties compared to its homogenized model. In particular, reflection near the critical angle is shown to strongly depend on even very small period variations, as well as on the choice of the multilayer termination. We identify the geometries for which the influence of the subwavelength features is maximized and demonstrate that the difference between the reflectance from the actual multilayer and the effective medium prediction can be as great as 0.98. The results of this analysis can be useful for high-precision multilayer ellipsometry and in sensing applications.
Original languageEnglish
Article number184001
JournalNanotechnology
Volume26
Issue number18
Number of pages11
ISSN0957-4484
DOIs
Publication statusPublished - 2015

Keywords

  • Dielectric metamaterial
  • Effective medium
  • Multilayer
  • Nanostructured device
  • Photonic crystal
  • Dispersions
  • Photonic crystals
  • Comprehensive analysis
  • Dielectric multilayers
  • Dispersion relations
  • Effective Medium Approximation
  • Nano-structured
  • Photonic multilayers
  • Sensing applications
  • Multilayers

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