Terahertz Time-Domain Ellipsometry With Spintronic Emitters: Pauli Coefficients as a Superior Alternative to Jones and Mueller Matrices
Year: 2025
Type: article
Abstract: We introduce terahertz complete time-domain spectroscopic ellipsometry (THz-cTDSE), extending traditional ellipsometry by determining full Jones and Mueller matrices for in-depth material characterization. This marks the first application of spintronic terahertz emitters in ellipsometry, achieving pure linear polarization for precise magnetization-based switching. Our complete phase-resolved ellipsometry transforms Jones matrices into an intuitive framework of diattenuations and retardations across all Stokes bases—Pauli exponential coefficients—previously unattainable with incomplete ellipsometry. A novel calibration technique ensures accurate Jones matrix reconstruction without requiring precise alignment of polarizing components, approaching the precision typical of visible-range ellipsometry. We demonstrate THz-cTDSE on quartz and Hg2Cl2crystals, advancing the analysis of anisotropic materials.
Institutions: VSB - Technical University of Ostrava, Institut d'Electronique, de Microélectronique et de Nanotechnologie, Centre National de la Recherche Scientifique, Université Paris Cité, École Normale Supérieure - PSL, Sorbonne Université, Laboratoire de Physique de l'Ecole Normale Supérieure, BBT-Materials Processing (Czechia), Université Paris-Saclay, Laboratoire Albert Fert, Université de Lille
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,645
OpenAlex ID: W4409427330