Abstract
Transmission measurements have been used to investigate the optical properties of polyvinylpyrrolidone films synthesized by the solgel route. The optical constants of films deposited on quartz substrates were determined by fitting transmission spectra in the wavelength range of 200–800 nm with the Tauc–Lorentz and Cody–Lorentz physical models. Combined with Urbach tail, both models give a good description of transmission data and reveal that refractive index of film slightly decreases with increasing PVP mass fraction. X-ray reflectivity (XRR) measurements were also performed on films to complement the thicknesses. The value of film thickness, including interface information from transmission spectra, is consistent with that result obtained from XRR, indicating that fitting transmission spectrum is a high reliable optical characterization.
© 2012 Optical Society of America
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