11 November 1991 Theoretical modeling of chiral composites
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Abstract
Studies of the role of chirality in the scattering of electromagnetic (EM) waves in a discrete random chiral composite are presented, using a vector multiple scattering formalism in the microwave region. For the first time the effect of concentration, chirality, and size of the individual scatterers are related to the chirality and wavenumber of the effective medium. The chiral composite is modeled as an infinite nonchiral medium containing a random distribution of identical finite scatterers made of a chiral material. The concept of a T-matrix for a single scatterer is used to relate the scattered EM fields to the exciting plane-polarized fields. Ensemble averaging over the position of the scatterers, along with the quasi-crystalline approximation (QCA), results in a frequency dependent dispersion equations. Under long wavelength approximation, dispersion relations relating wavenumbers K(L), K(R) of the scattered left- and right-circularly polarized (LCP and RCP) waves are obtained and it is verified that they are circularly polarized. From a knowledge of these wavenumbers, the effective wavenumber and effective chirality of the chiral composite medium can be obtained.
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R. T. Apparao, Vasundara V. Varadan, Vijay K. Varadan, "Theoretical modeling of chiral composites", Proc. SPIE 1558, Wave Propagation and Scattering in Varied Media II, (11 November 1991); doi: 10.1117/12.49608; https://doi.org/10.1117/12.49608
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