Preparation of single-walled carbon nanotube film and its optical property

In order to prepare actual optoelectronic devices using single-walled carbon nanotubes,single-walled carbon nanotube / polyimide( SWCNT / PI) film with the single-walled carbon nanotubes in mass fraction of 0. 02 was prepared by means of a new gradient temperature-elevating thermal imidization method. The reflectance,transmittance,and absorbance of the film were measured with a spectrophotometer and the linear refractive index variation with wavelength of SWCNT / PI film was obtained. Simultaneously,the Sellmeyer parameters of the SWCNT / PI film were got by fitting the Sellmeyer formula. Then,the third order nonlinear optical property of the SWCNT / PI film was studied by means of zscanning. The experiments showed that the nonlinear absorption coefficient and the nonlinear refractive coefficient of the film were- 5. 3 × 10- 9cm / W and- 4. 1 × 10- 13cm2/ W,respectively. The results prove that SWCNT / PI film owns strong nonlinear optical property.