The optical constants determination of thin-films

Authors : A. Sardarzaei, Z. Kiamehr

Pages : 721-728

View : 13 | Download : 10

Publication Date : 2015-05-13

Article Type : Review

Abstract :Abstract. A method for calculating the optical constants of weakly absorbing homogeneous thin films of refractive index, n lower than substrate index, s (s < n) and extinction coefficient, k from the spectral Transmission information alone with no prior knowledge of their characteristics was studied. Initially the procedure uses transmission turning point data to estimate the refractive index, n and extinction coefficient, k by an analytical approach. The calculations are done from the knowledge of transmission turning point data, which was obtained from Shimadzu UV3100 spectrophotometer. The data are then fitted to a high order polynomial function that undergoes an iterative refinement routine by means of a goal seek routine to determine with good accuracy the film parameters as a function of wavelength.
Keywords : optical constants, refractive index, transmission, thin films, turning point and weakly absorbing