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We report on the transmission over a wide frequency range (from the far infrared through the visible) of\udpristine and hole-doped, free-standing carbon nanotube films at temperatures between 50 and 300 K. Optical\udconstants are estimated by Kramers-Kronig analysis of the transmittance. We see evidence in the far infrared\udfor a gap below 10 meV. Hole doping causes a shift of spectral weight from the first interband transition into\udthe far infrared. Temperature dependence in both the doped and undoped samples is restricted to the farinfrared\udregion

Charge dynamics in transparent single-walled carbon nanotube films from optical transmission measurements