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

Abstract

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.