An O(M) algorithm evaluates azimuthal Fourier modes of the 3D Helmholtz Green's function and derivatives with cost independent of wavenumber and separation.
An FFT-accelerated direct solver for electromagnetic scatter- ing from penetrable axisymmetric objects.Journal of Computational Physics, 390:152–174
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Fast Evaluation of the Azimuthal Fourier Modes of the 3D Helmholtz Green's Function and Their Derivatives
An O(M) algorithm evaluates azimuthal Fourier modes of the 3D Helmholtz Green's function and derivatives with cost independent of wavenumber and separation.