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Applied Optics

Applied Optics


  • Vol. 28, Iss. 11 — Jun. 1, 1989
  • pp: 2165–2169

Backscattering enhancement by randomly distributed very large particles

Yasuo Kuga and Akira Ishimaru  »View Author Affiliations

Applied Optics, Vol. 28, Issue 11, pp. 2165-2169 (1989)

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Recently, the backscattering enhancement by densely distributed particles of a size comparable to the wavelength was reported. It has been explained as the constructive interference of two waves traveling in opposite directions. This enhancement was observed only in densely distributed particles, and its existence in sparsely distributed media has not been verified yet. In this paper we present the experimental evidence of backscattering enhancement by sparsely distributed very large particles. Experiments are conducted using 45-μm latex particles which are approximately 100 times the wavelength. Both copolarized and cross-polarized components are measured for different particle concentrations. Unlike for small particles, back-scattering enhancement is most noticeable when the particle concentration is low. The angular width of the peak is comparable to the ratio (wavelength)/(particle size) and is independent of the optical distance.

© 1989 Optical Society of America

Original Manuscript: July 20, 1988
Published: June 1, 1989

Yasuo Kuga and Akira Ishimaru, "Backscattering enhancement by randomly distributed very large particles," Appl. Opt. 28, 2165-2169 (1989)

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  1. Y. Kuga, A. Ishimaru, “Retroreflectance from a Dense Distribution of Spherical Particles,” J. Opt. Soc. Am. A 1, 831–835 (1984). [CrossRef]
  2. Y. Kuga, A. Ishimaru, “Depolarization Effects of the Enhanced Retroreflectance from a Dense Distribution of Spherical Particles,” J. Opt. Soc. Am. A 2, 616–618 (1985). [CrossRef]
  3. M. van Albada, A. Lagendijk, “Observation of Weak Localization of Light in a Random Medium,” Phys. Rev. Lett. 55, 2692–2695 (1985). [CrossRef] [PubMed]
  4. P. E. Wolf, G. Maret, “Weak Localization and Coherent Backscattering of Photon in Disordered Media,” Phys. Rev. Lett. 55, 2696–2699 (1985). [CrossRef] [PubMed]
  5. L. Tsang, A. Ishimaru, “Backscattering Enhancement of Random Discrete Scatterers,” J. Opt. Soc. Am. A 1, 836–839 (1984). [CrossRef]
  6. A. Ishimaru, L. Tsang, “Backscattering Enhancement of Random Discrete Scatterers of Moderate Sizes,” J. Opt. Soc. Am. A 5, 228–236 (1988). [CrossRef]
  7. Y. Kuga, A. Ishimaru, “Backscattering Enhancement by Randomly Distributed Particles of Different Sizes,” Proc. Soc. Photo-Opt. Instrum. Eng.927, 33–37 (1988), to be published.
  8. Y. A. Kravtsov, A. I. Saichev, “Effects of Double Passage of Waves in Randomly Inhomogeneous Media,” Sov. Phys. Usp. 25, 494–508 (1983). [CrossRef]
  9. V. I. Tatarskii, “Some New Aspects in the Problem of Waves and Turbulence,” Radio Sci. 22, 859–865 (1987). [CrossRef]
  10. Y. Kuga, A. Ishimaru, Q. Ma, “The Second-Order Multiple Scattering Theory for the Vector Radiative Transfer Equation,” Radio Sci. accepted for publication.
  11. D. A. De Wolf, “Electromagnetic Reflection from an Extended Turbulent Medium: Cumulative Forward-Scatter Single-Backscatter Approximation,” IEEE Trans. Antennas Propag. AP-19, 254–262 (1971). [CrossRef]

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