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Negative principal refractive indices and accidental isotropy in two-dimensional photonic crystals with an asymmetrical unit ce

DDSCAT 7.3 is a freely available open-source Fortran-90 software package applying the “discrete dipole approximation” (DDA) to calculate scattering and absorption of electromagnetic waves by targets with arbitrary geometries and complex refractive index. The targets may be isolated entities (e.g., ...