Convergent Power Series for Fields in Positive or Negative High-Contrast Periodic Media

Details Convergent Power Series for Fields in Positive or Negative High-Contrast Periodic Media Convergent Power Series for Fields in Positive or Negative High-Contrast Periodic Media

2010-07-15

arxiv.org/abs/1007.2640v1

Physics

Mathematical Physics

Scientific paper

We obtain convergent power series representations for Bloch waves in periodic high-contrast media. The material coefficient in the inclusions can be positive or negative. The small expansion parameter is the ratio of period cell width to wavelength, and the coefficient functions are solutions of the cell problems arising from formal asymptotic expansion. In the case of positive coefficient, the dispersion relation has an infinite sequence of branches, each represented by a convergent even power series whose leading term is a branch of the dispersion relation for the homogenized medium. In the negative case, there is a single branch.

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