title: Simultaneous determination of thickness and optical constants of polymer thin film by analyzing transmittance.
abstract: We present a novel method for determining both the thickness and the optical constants of a weakly absorbing thin film upon a nearly transparent substrate through analysis of transmittance measured at various incident angles with coherent light. We demonstrate this method for a polymer thin film. The refractive indices and extinction coefficients of poly(DRI-anthranilic acid) at wavelengths of 1,064, 632.8, and 532 nm were determined for the first time to our knowledge. We also confirmed the validity of our method with a polystyrene thin film whose optical constant was known. It was found that a thickness of a few hundred nanometers can easily be measured and that this method offers simplicity as well as the capability of in situ measurement.
authors.affiliation: Department of Physics, Sogang University, Seoul, Korea.
authors.forename: Changsoo
authors.initials: C
authors.lastname: Jung
authors.forename: Bum Ku
authors.initials: BK
authors.lastname: Rhee