title: Spectral artifacts from non-uniform samples analyzed by terahertz time-domain spectroscopy.
abstract: 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.
authors: Defence Research & Development Canada (DRDC) Valcartier, Québec, Canada. francis.theberge@drdc-rddc.gc.ca
authors: Francis
authors: F
authors: Théberge
authors: Marc
authors: M
authors: Châteauneuf
authors: Jacques
authors: J
authors: Dubois
authors: Sylvain
authors: S
authors: Désilets
authors: Louis-Simon
authors: LS
authors: Lussier
mesh_terms: D016477:Artifacts; D007785:Lactose / Q000737:chemistry; D008420:Manufactured Materials; D015233:Models, Statistical; D008962:Models, Theoretical; D055095:Optics and Photonics; D011091:Polyesters / Q000737:chemistry; D011138:Polytetrafluoroethylene; D011208:Powders; D011827:Radiation; D055069:Terahertz Imaging / Q000379:methods*; D055068:Terahertz Spectroscopy / Q000379:methods*
chemical_list: D011091:Polyesters; D011208:Powders; D011138:Polytetrafluoroethylene; D007785:Lactose