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TEM image of the DWNTs.
Power absorptions, indices of refraction, extinction coefficients, and real conductivities of KBr (open circle), DWNT sample (closed triangle), DWNT sample (closed square), SWNT sample (open triangle), and SWNT sample (open square) with fit lines by the Bruggman effective medium approximation (BEMA).
Raman intensities of single-walled carbon nanotubes (solid line) and double-walled carbon nanotubes (dashed line) at .
Fitting parameters of the Bruggman effective medium approximation (unit: THz). (Note that is the filling factor (volume), is the dielectric constant of infinity, is the plasma frequency, is the damping rate, is the oscillator strength of the Lorentz oscillator, is the phonon frequency, and is the spectral width.).
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