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Effective medium approximation is derived to estimate the effective refractive index n e and the group velocity v g in two-phase composites in which one of the components is non-spherical, and even distributed in shape. Enhanced group velocity may be achieved through the suitable adjustment of the particles' shape and shape distribution. The range of the volume fractions, in which the group velocity is enhanced, will expand, once we take into account the non-spherical shape or the shape distribution. Therefore, the non-spherical shape and shape distribution play crucial roles in determining the group velocity in two-phase composites.
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Gao et al. (2005) studied this question.
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