Linear Dichroism Detection and Analysis in Terahertz Spectral Range

Two simple experimental techniques of quantitative linear dichroism analysis were developed with Jones calculus for polarization-sensitive terahertz time-domain spectroscopy. Both of them involve the optical measurements at only three angles of rotation for sample or polarizer setup. Such non-destructive evaluation techniques could be a useful addition for quality control of polymer or composite materials. As an example, the production-induced linear dichroism in polytetrafluoroethylene was detected, analyzed, and interpreted as a result of the well-aligned macromolecular arrangement within optical volume probed by terahertz beam.