Optoacoustic effect in dense layers of oriented carbon nanotubes: Its use for measuring the optical absorption coefficient and the film thickness

The optoacoustic effect is used to measure the coefficient of light absorption at a wavelength of 0.53 μm by a dense layer of oriented carbon nanotubes on a quartz substrate. The value of the absorption coefficient is found to be equal to 3 × 10⁶ m⁻¹. This value is compared with the theoretical estimates and the estimate obtained from the reflection coefficient with the use of the Kramers-Kronig relation. With the coefficient of light absorption being known, the optoacoustic effect allows one to measure the film thickness at any point without destroying the film. Original Russian Text Sc I.S. Grudzinskaya, Z.Ya. Kosakovskaya, O.B. Ovchinnikov, I.A. Chaban, 2006, published in Akusticheskiĭ Zhurnal, 2006, Vol. 52, No. 3, pp. 330–334.