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Convergent adaptive finite element methods for photonic \ud crystal applications

By Stefano Giani


We prove the convergence of an adaptive finite element method for computing the band structure of 2D \ud periodic photonic crystals with or without compact defects in both the TM and TE polarization cases. These \ud eigenvalue problems involve non-coercive elliptic operators with discontinuous coefficients. The error analysis \ud extends the theory of convergence of adaptive methods for elliptic eigenvalue problems to photonic crystal \ud problems, and in particular deals with various complications which arise essentially from the lack of coercivity \ud of the elliptic operator with discontinuous coefficients. We prove the convergence of the adaptive method in \ud an oscillation-free way and with no extra assumptions on the initial mesh, beside the conformity and shape \ud regularity. Also we present and prove the convergence of an adaptive method to compute efficiently an entire \ud band in the spectrum. This method is guaranteed to converge to the correct global maximum and minimum \ud of the band, which is a very useful piece of information in practice. Our numerical results cover both the cases \ud of periodic structures with and without compact defects

Publisher: World Scientific
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Provided by: Nottingham ePrints

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