Terahertz birefringence for orientation analysis.
A terahertz time-domain spectrometer is employed to study different birefringent samples. We develop a method based on the temporal waveform and the impulse response of a sample to map the anisotropy of their inner structure. To validate our algorithm, we study the polarization-affecting structure of various classes of materials such as crystals, plastics, and natural products. Among all samples we observe the largest birefringence for a rutile crystal with Deltan=3.3 at 1 THz.
Institut für Hochfrequenztechnik, Technische Universität Braunschweig, Schleinitzstrasse 22, 38106 Braunschweig, Germany. ch.joerdens@tu-bs.de
Christian
C
Jördens
Maik
M
Scheller
Matthias
M
Wichmann
Martin
M
Mikulics
Karin
K
Wiesauer
Martin
M
Koch
D000465:Algorithms; D016880:Anisotropy; D001718:Birefringence; D003461:Crystallography / Q000295:instrumentation; D008422:Materials Testing / Q000295:instrumentation* / Q000379:methods*; D008962:Models, Theoretical; D055068:Terahertz Spectroscopy