Terahertz Time-Domain Ellipsometry With Spintronic Emitters: Pauli Coefficients as a Superior Alternative to Jones and Mueller Matrices

IF 3.9 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Terahertz Science and Technology Pub Date : 2025-04-14 DOI:10.1109/TTHZ.2025.3559074

Pierre Koleják;Jiaming Liu;Robin Silber;Martin Mičica;Ondřej Ballada;Čestmír Barta;Romain Lebrun;Nicolas Tiercelin;Mathias Vanwolleghem;Kamil Postava

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Abstract

In this article, 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 Hg

$_{2}$

crystals, advancing the analysis of anisotropic materials.

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自旋电子发射体的太赫兹时域椭偏：泡利系数是琼斯和穆勒矩阵的优越选择

在本文中，我们介绍了太赫兹完全时域光谱椭圆偏振（THz-cTDSE），通过确定完整的Jones和Mueller矩阵来扩展传统的椭圆偏振，以深入表征材料。这标志着自旋电子太赫兹发射器在椭偏测量中的首次应用，实现了基于精确磁化开关的纯线性极化。我们的完全相位分辨椭圆偏振将琼斯矩阵转换成一个直观的框架，该框架涵盖了所有斯托克斯基-泡利指数系数的衰减和延迟，这是以前用不完全椭圆偏振无法实现的。一种新的校准技术确保了精确的琼斯矩阵重建，而不需要精确对准偏振元件，接近可见光范围内典型的椭圆偏振精度。我们在石英和Hg$_{2}$Cl$_{2}$晶体上证明了太赫兹- ctdse，推进了各向异性材料的分析。

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来源期刊

IEEE Transactions on Terahertz Science and Technology ENGINEERING, ELECTRICAL & ELECTRONIC-OPTICS

CiteScore

7.10

自引率

9.40%

发文量

102

期刊介绍： IEEE Transactions on Terahertz Science and Technology focuses on original research on Terahertz theory, techniques, and applications as they relate to components, devices, circuits, and systems involving the generation, transmission, and detection of Terahertz waves.