Open AccessRefractive index calculation from echo interference in pulsed terahertz spectroscopy
Author(s) -
Sanjuan F.,
Vidal B.
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2013.3937
Subject(s) - terahertz radiation , interference (communication) , refractive index , echo (communications protocol) , optics , materials science , spectroscopy , terahertz spectroscopy and technology , index (typography) , optoelectronics , nuclear magnetic resonance , physics , telecommunications , computer science , computer network , world wide web , channel (broadcasting) , quantum mechanics
A method for calculating the average refractive index of a sample using transmission terahertz time‐domain spectroscopy in a single measurement is presented. The refractive index is derived from the analysis of the frequency‐domain interference caused by Fabry‐Pérot reflections in the sample through the discrete Fourier transform of the spectrum module. This approach is simple and fast (not requiring a reference measurement), improves sensitivity over direct time‐domain analysis and allows the derivation of the refractive index in a specific frequency window. The method can also be used to identify unwanted reflections in the experimental setup.