Testing the validity of THz reflection spectra by dispersion relations

TL;DR

This paper evaluates the consistency of terahertz reflection spectra using dispersion relation algorithms applied to complex response functions, aiding in verifying spectral correction methods for improved data accuracy.

Contribution

It introduces the use of dispersion relation algorithms for integer powers of complex reflection coefficients to validate terahertz spectroscopic data.

Findings

Algorithms effectively check spectral correction success

Dispersion relations reveal data consistency issues

Method enhances reliability of terahertz spectroscopy

Abstract

Complex response function obtained in reflection spectroscopy at terahertz range is examined with algorithms based on dispersion relations for integer powers of complex reflection coefficient, which emerge as a powerful and yet uncommon tools in examining the consistency of the spectroscopic data. It is shown that these algorithms can be used in particular for checking the success of correction of the spectra by the methods of Vartiainen et al [1] and Lucarini et al [2] to remove the negative misplacement error in the terahertz time-domain spectroscopy.