Reflectance anisotropy spectroscopy (RAS) is used to study anisotropic polymer thin films. The measured spectra are interpreted in terms of molecular orientation at the polymer surface. It is shown that RAS spectra of thin transparent films resemble the logarithmic derivative of the corresponding polarization-averaged reflection spectra. The amplitudes of the spectra are found to be highly sensitive to the optical retardation in the anisotropic layer.
Journal of Physics D Applied Physics
- Pub Date:
- January 2003