Comparison of random errors with dynamic range in the optical parameters of ZnTe measured by THz-TDS

This study aims to compare the random errors in optical constants like transmittance and absorption coefficients estimated from the sets of intensity spectra with dynamic range obtained from the noise floor in one spectrum measured by THz TDS for ZnTe samples. Results revealed that the error obtained from the noise floor and the statistical analysis simultaneously could show the frequency limit of detectable transmittance and absorption coefficients. Moreover, a new model is proposed to estimate the random error in optical constants with a single set of reference and sample data and it is observed that the standard deviation obtained from the proposed model fits well to that of standard deviation calculated statistically.