2023/12/20 by Zhenisbek Tagay, Tagay, Zhenisbek, Ralph Romero +3 · 1 citation
Chemistry · Engineering · #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Materials Science (cond-mat.mtrl-sci) #Optics (physics.optics) #Photonic and Optical Devices #Spectroscopy and Laser Applications #Strongly Correlated Electrons (cond-mat.str-el) #Terahertz technology and applications
paper · pdf · doi:10.48550/arxiv.2312.13276
openalex publication_date 2023/12/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
We present a new method for high precision measurements of polarization rotation in the frequency range from 0.2 to 2.2 THz using a fiber coupled time-domain THz spectrometer. A free standing wire-grid polarizer splits THz light into orthogonal components which are then measured by two separate detectors simultaneously. We theoretically model the uncertainties introduced by optical component non-idealities and predict that we may expect to achieve precisions of order 2.3 μrad (0.13 mdeg) and accuracies of 0.8% when anti-symmetrizing the response with respect to an applied field. Anti-symmetrization improves precision by more than four orders of magnitude. We demonstrate this method on a 2D electron gas in magnetic field and show that we achieve a precision of 20 μrad (1.1 mdeg) for small polarization rotation angles. A detailed description of the technique and data analysis procedure is provided, demonstrating its capability to precisely measure polarization states in the 0.2 to 2.2 THz range.