STRUCTURAL RESONANCES IN A DIELECTRIC SPHERE ILLUMINATED BY AN EVANESCENT-WAVE

Mie scattering of an evanescent wave by a dielectric sphere has been t heoretically treated by Chew et al. [Appl. Optics 18 (1979) 2679]. We found some discrepancies between our expansion coefficients and that o f Chew. The correct analytic expressions are given by reviewing the th eory shortly. Furthermore, we investigate the resonance structure and the source function for different decay rates of the evanescent wave. Numerical results are given for the differential scattering cross sect ion and the source function. Source functions for resonant and nonreso nant cases are presented for different penetration depths of the evane scent wave.