Abstract
The translation matching method (TMM) was presented here to obtain the refractive index (RI) of chalcogenide films more accurately. It solved the problem of calculation errors of the RI of the film that resulted from using the Swanepoel method after conventional treatments such as illumination, electrical measurement, and annealing. The TMM was suitable for calculating the RI of the film by calibrating the transmission spectrum regardless of whether it had been dealt with. The accuracy of the RI calculation is about 0.1% using the method. Experimentally, the method was used to obtain the RI of three chalcogenide films: they are original homogeneous film and RI nonuniform film treated by annealing and by femtosecond laser direct writing, respectively. The results showed that the decrease in the transmittance and weakened interference effect were effectively overcome and the RI of the three kinds of films was accurately obtained by using the method. This work should provide a useful guideline for obtaining the RI of the transparent optical films.
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