A new method to determine the continuous refractive index of an absorbing film by Generalized Stockwell Transform

Generalized Stockwell Transform (GST) was adapted to analyze a transmittance signal to continuously determine the refractive index and extinction coefficient. The process is built by analyzing oscillation frequencies of the transmission signal where oscillations exist. The simulation studies clearly show the advantage of the locally referenced phase property of the presented method. The validity of the method was checked for a CdS thin film. The results determined by the GST method are consistent with the results determined by envelope and other signal analyzing methods, and the literature. The noise and relative error analysis of the method was also discussed.

Automated summary

The Generalized Stockwell Transform (GST) was used to analyze a transmittance signal and continuously determine the refractive index and extinction coefficient. The method involves analyzing the oscillation frequencies of the transmission signal and has been proven to have advantages in the locally referenced phase property. The validity of the method was confirmed through the analysis of a CdS thin film, and the results were consistent with other signal analyzing methods and literature.