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., ...More

JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, vol.103, no.1, pp.156-167, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 103 Issue: 1
  • Publication Date: 2007
  • Doi Number: 10.1016/j.jqsrt.2006.06.001
  • Journal Name: JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.156-167
  • Keywords: aggregate, dielectric sphere, microwave, scattering, T-matrix method, DDA method, microwave analogy, DISCRETE-DIPOLE APPROXIMATION, ELECTROMAGNETIC SCATTERING, ABSORPTION
  • Middle East Technical University Affiliated: Yes

Abstract

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.