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Transmittance of the ensembles for mean particle radius ranging from 5 to . The dashed vertical lines on the graph indicate the frequency values for which the transmittance will be studied as a function of particle size. The inset depicts the power spectrum of the incident pulse.
(a) Log-log plot of the measured transmittance of the ensemble at 0.20 THz (inverted triangles), 0.14 THz (squares), 0.09 THz (upright triangles), and 0.055 THz (diamonds) as a function of the mean particle radius. Measurements at each value of particle radius are obtained from the average of at least three independent measurements. The solid lines (as they appear in the figure from left to right) are the predicted transmittance curves calculated at 0.20 THz, 0.14 THz, 0.09 THz, and 0.055 THz using Eq. (4) with a volume fraction matching the experimental conditions. (b) Depicts the real (solid line) and imaginary (dotted line) parts of the complex effective refractive index (left vertical axis) and the complex effective permittivity (right vertical axis) of the ensemble at 0.055 THz.
Polar plot of the angular distribution of the electric field amplitude of the transmitted pulse through (a) the empty sample cell, (b) the -radius particle ensemble, and (c) the -radius particle ensemble. The angular distribution of the electric field amplitude in each plot corresponds to the average of at least three independent measurements.
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