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Mie theory is one of the main tools describing scattering of propagatingelectromagnetic waves by spherical particles. Evanescent optical fields arealso scattered by particles and exert radiation forces which can be used foroptical near-field manipulations. We show that the Mie theory can be naturallyadopted for the scattering of evanescent waves via rotation of its standardsolutions by a complex angle. This offers a simple and powerful tool forcalculations of the scattered fields and radiation forces. Comparison withother, more cumbersome, approaches shows perfect agreement, thereby validatingour theory. As examples of its application, we calculate angular distributionsof the scattered far-field irradiance and radiation forces acting on dielectricand conducting particles immersed in an evanescent field.

Mie scattering and optical forces from evanescent fields: A complex-angle approach