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(a) Terahertz-TDS measured power absorption (open circles) and the theoretical fitting through the classical pseudoharmonic model and the Bruggeman effective medium approximation (solid curve); (b) measured refractive index (open circles) and the theoretical fitting (solid curve).
Complex dielectric constant of : (a) measured real part of dielectric constant (open circles) and the theoretical fitting (solid curve); (b) measured imaginary dielectric constant (open circles) and the theoretical fitting (solid curve).
(Color online) Completed low-frequency optical response of : the open circles are measured by terahertz-TDS in the frequency region of , and the solid curve is the Raman spectrum recorded from . The inset shows the detailed feature of the measured TO1 mode.
(Color online) Comparison of terahertz-TDS results of (a) power absorption and (b) refractive index of pure powder (squares) with that of single-crystalline (circles) and thin-film (crosses, obtained from Ref. 7) . The solid lines represent theoretical fit.
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