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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 73, Iss. 3 — Mar. 1, 1983
  • pp: 408–410

Variational calculations of electromagnetic scattering from two randomly separated Rayleigh dielectric cylinders

J. A. Krill, R. H. Andreo, and R. A. Farrell  »View Author Affiliations

JOSA, Vol. 73, Issue 3, pp. 408-410 (1983)

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The exact solution, Born approximation, and its variational improvement are obtained for the scattering of electromagnetic waves from two randomly separated Rayleigh dielectric cylinders. This special model is used to test a recently developed vector stochastic variational principle. The variational results are shown to account accurately for the geometric polarizability of the cylinders as well as for multiple scattering and interference.

© 1983 Optical Society of America

J. A. Krill, R. H. Andreo, and R. A. Farrell, "Variational calculations of electromagnetic scattering from two randomly separated Rayleigh dielectric cylinders," J. Opt. Soc. Am. 73, 408-410 (1983)

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  1. L. Cairo and T. Kahan, Variational Techniques in Electromagnetism (Gordon and Breach, New York, 1965).
  2. P. M. Morse and H. Feshbach, Methods of Theoretical Physics, Parts I and II (McGraw-Hill, New York, 1953).
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  6. V. Twersky, "Multiple scattering of radiation by an arbitrary planar configuration of parallel cylinders and by two parallel cylinders," J. Appl. Phys. 23, 407–414 (1952).
  7. J. A. Krill and R. A. Farrell, "Comparisons between variational, perturbational, and exact solutions for scattering from a random rough surface model," J. Opt. Soc. Am. 68, 768–774 (1978).
  8. J. A. Krill and R. H. Andreo, "Vector stochastic variational principles for electromagnetic wave scattering," IEEE Trans. Antennas Propag. AP-28, 770–776 (1980).
  9. R. H. Andreo and J. A. Krill, "Vector stochastic variational expressions for scatterers with dielectric, conductive, and magnetic properties," J. Opt. Soc. Am. 71, 978–982 (1981).
  10. The variationally invariant approximation for the small packing density limit of the many-Rayleigh-cylinder model is of the same form as the two-cylinder case (i.e., the N = 2 case), except that factors of 1/N go to zero instead of to 0.5 (as was also found7 for the hemicylinder case). Our studies of trial function effects5,18 suggest that the plane-wave Born trial field should give accurate results for ka ≲ 1. We do not present the many-cylinder results because the purpose of this study was to demonstrate that variational calculations with simple trial field can account for polarization effects, and we do not have an exact solution for the many-cylinder model.
  11. J. A. Krill, R. H. Andreo, and R. A. Farrell, "Calculational procedures for variational, Born, and exact solutions for electromagnetic scattering from two randomly separated dielectric Rayleigh cylinders," JHU/APL Tech. Rep. (Johns Hopkins University, Laurel, Md., 1983).
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  14. H. C. van de Hulst, Light Scattering by Small Particles (Wiley, New York, 1957).
  15. This result can also be obtained using the theory of distribution or generalized functions as discussed inJ. J. H. Wang, "A unified and consistent view on the singularities of the electric dyadic Green's function in the source region," IEEE Trans. Antennas Propag. AP-30, 463–468 (1982).
  16. A. D. Yaghjian, "Electric dyadic Green's functions in the source region," Proc. IEEE 68, 248–263 (1980).
  17. J. A. Krill, R. H. Andreo, and R. A. Farrell, "A computational alternative for variational expressions that involve dyadic Green functions," IEEE Trans. Antennas Propag. AP-30, 1003–1005 (1982).
  18. M. L. Feinstein and R. A. Farrell, "Trial functions in variational approximations to long wavelength scattering," J. Opt. Soc. Am. 72, 223–231 (1982).

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