Simultaneous measurement of circular dichroism and Faraday rotation at terahertz frequencies using heterodyne detection
Abstract
A far-infrared system measures the full complex Faraday angle, rotation as well as ellipticity, with an unprecedented accuracy of 10\,μrad/T. The system operates on several far-infrared laser lines in the spectral range from 0.3 to 6 THz and produces results as a continuous function of temperature from 10 to 310K and applied fields between 8\,T. Materials successfully measured include GaAs 2-DEG heterostructures, various high temperature superconductors including Bi2Sr2CaCu2O8+x, Pr2 - xCexCuO4, and La2-xSrxCuO4, and single crystals of the topological insulator Bi2Se3.
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