Polarization modulation time-domain terahertz polarimetry.
We present high precision measurements of polarization rotations in the frequency range from 0.1 to 2.5 THz using a polarization modulation technique. A motorized stage rotates a polarizer at ~ 80 Hz, and the resulting modulation of the polarization is measured by a lock-in technique. We achieve an accuracy of 0.050° (900 μrad) and a precision of 0.02° (350 μrad) for small rotation angles. A detailed mathematical description of the technique is presented, showing its ability to fully characterize elliptical polarizations from 0.1 to 2.5 THz.
Department of Physics and Astronomy, The Johns Hopkins University, 3400 N Charles St, Baltimore, Maryland 21218, USA.
C M
CM
Morris
R Valdés
RV
Aguilar
A V
AV
Stier
N P
NP
Armitage
D004867:Equipment Design; D019544:Equipment Failure Analysis; D012031:Refractometry / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*; D055053:Terahertz Radiation