Open AccessSpectral artifacts from non-uniform samples analyzed by terahertz time-domain spectroscopy
Author(s) -
F. Théberge,
Marc Châteauneuf,
Jacques Dubois,
S. Désilets,
LouisSimon Lussier
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.010841
Subject(s) - terahertz radiation , terahertz spectroscopy and technology , optics , spectroscopy , terahertz time domain spectroscopy , absorption (acoustics) , absorption spectroscopy , materials science , coherence (philosophical gambling strategy) , photomixing , distortion (music) , attenuation coefficient , fourier transform spectroscopy , spectral line , physics , optoelectronics , fourier transform infrared spectroscopy , far infrared laser , laser , terahertz metamaterials , amplifier , cmos , quantum mechanics , astronomy
We report the impact of the spatial coherence distortion on the measured absorption spectra and the identification of materials analyzed by terahertz time-domain spectroscopy. It is shown that the deformation of the terahertz beam wave front can result into the overestimation of the electromagnetic absorption, the generation of artificial absorption peaks and even to the disappearance of characteristic absorption peaks. Obtaining clear absorption spectra without artifacts is crucial for applications based on terahertz imaging and spectroscopy.