Amplitude and phase of light scattered by micro-scale aggregates of dielectric spheres: Comparison between theory and microwave analogy experiments

Sabouroux P., Stout B., Geffrin J. M., Eyraud C., Ayranci I., Vaillon R., ...Daha Fazla

JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, cilt.103, sa.1, ss.156-167, 2007 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 103 Sayı: 1
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1016/j.jqsrt.2006.06.001
  • Dergi Adı: JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.156-167
  • Anahtar Kelimeler: aggregate, dielectric sphere, microwave, scattering, T-matrix method, DDA method, microwave analogy, DISCRETE-DIPOLE APPROXIMATION, ELECTROMAGNETIC SCATTERING, ABSORPTION
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Light scattering is a useful diagnostic tool for characterization of particles. Direct scattering measurements for arbitrarily shaped micro-scale particles is difficult due to small-scale limitations. Microwave analogy is a convenient approach to realize such measurements as it enables realization of analogous experiments with larger model particles in a spectral domain where wavelengths are on centimeter scale. In the present study a test model analogous to light scattering by a micro-scale aggregate of dielectric spheres was constructed and experimentally characterized in the microwave regime. Measured amplitude and phase of the scattered field were compared with theoretical predictions obtained from quasi-exact multiple-scattering T-matrix method and discrete dipole approximation (DDA). Excellent agreement demonstrates the validities of both the experiment and the models. (c) 2006 Elsevier Ltd. All rights reserved.