We report the equiphase-sphere (EPS) approximation for characterizing light scattering by nonspherical and inhomogeneous particles. Our finite-difference-time-domain numerical experiments demonstrate the feasibility of using the EPS method to calculate the total-scattering-cross-section spectra for a wide range of particle geometries. Validity conditions of the EPS method are derived and validated.

© 2004 Optical Society of America

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