Optics and Spectroscopy

, Volume 92, Issue 2, pp 221–226

S-approximation for spherical particles with a complex refractive index

  • A. Ya. Perel’man
  • V. Voshchinnikov
Physical and Quantum Optics


The approximation of optically soft particles (S-approximation) for components of electromagnetic field and efficiency factors is considered within the framework of the problem of diffraction of a plane electromagnetic wave at a sphere. Representations for the efficiency factors of scattering and absorption are obtained in the Rayleigh-Gans approximation for weakly absorbing particles with the help of the S-approximation. The proposed modification of the S-approximation with consideration for the short-wavelength asymptotics for field components allows the factors of extinction efficiency to be accurately calculated for large spheres with a complex refractive index m=nik, where 1≤n≤2 and 0≤k≤0.5.


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Copyright information

© MAIK “Nauka/Interperiodica” 2002

Authors and Affiliations

  • A. Ya. Perel’man
    • 1
  • V. Voshchinnikov
    • 2
  1. 1.St. Petersburg Academy of Wood TechnologySt, PetersburgRussia
  2. 2.Sobolev Institute of AstronomySt. Petersburg State UniversityRussia

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