Raman Spectroscopy of Laminated Polymer Films by Integrated Optical Techniques

Raman spectra have been observed from two adjacent thin polymer films and the interfacial region. This has been made possible by the application of integrated optical techniques to Raman spectroscopy. The observed Raman spectra have their strongest intensity contributions from regions near the optical field intensity maxima, which can occur in either film or at the interface. Both the optical intensity and the scattering volume are increased significantly and Raman spectra with good signal-to-noise ratios can be obtained. The method will be briefly illustrated and spectra for a thin film of poly(styrene) on a film of polyvinyl alcohol) will be shown for various (modes) optical profiles.