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• W2147963069 abstract "In this paper, we consider band structure calculations governed by the Helmholtz or Maxwell equations in piecewise homogeneous periodic materials. Methods based on boundary integral equations are natural in this context, since they discretize the interface alone and can achieve high order accuracy in complicated geometries. In order to handle the quasi-periodic conditions which are imposed on the unit cell, the free-space Green’s function is typically replaced by its quasi-periodic cousin. Unfortunately, the quasi-periodic Green’s function diverges for families of parameter values that correspond to resonances of the empty unit cell. Here, we bypass this problem by means of a new integral representation that relies on the free-space Green’s function alone, adding auxiliary layer potentials on the boundary of the unit cell itself. An important aspect of our method is that by carefully including a few neighboring images, the densities may be kept smooth and convergence rapid. This framework results in an integral equation of the second kind, avoids spurious resonances, and achieves spectral accuracy. Because of our image structure, inclusions which intersect the unit cell walls may be handled easily and automatically. Our approach is compatible with fast-multipole acceleration, generalizes easily to three dimensions, and avoids the complication of divergent lattice sums." @default.
• W2147963069 created "2016-06-24" @default.
• W2147963069 creator A5037306695 @default.
• W2147963069 creator A5074875493 @default.
• W2147963069 date "2010-09-01" @default.
• W2147963069 modified "2023-09-25" @default.
• W2147963069 title "A new integral representation for quasi-periodic fields and its application to two-dimensional band structure calculations" @default.
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• W2147963069 doi "https://doi.org/10.1016/j.jcp.2010.05.029" @default.
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