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arXiv · 2602.15760

Polarization-resolved measurement of forward volume spin waves by micro-focused Brillouin light scattering

Krzysztof Szulc·Mengying Guo·Ondřej Wojewoda·Hongyu Wang·Dominik Pavelka·Jan Klíma·Jakub Krčma·Xiufeng Han·Qi Wang·Michal Urbánek
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Abstract

We show how the micro-focused BLS signal of forward volume spin waves is formed and why it remains observable despite symmetry-based "suppression" expectations. A reciprocity-theorem based model with vectorial diffraction-limited focusing identifies the nonnegligible longitudinal focal-field component as the key element responsible for BLS sensitivity in the forward volume geometry. We further demonstrate that full polarization analysis, implemented through polarizer-analyzer maps of coherently excited spin waves, provides information beyond the conventional crossed polarizer-analyzer readout. In a BiYIG thin film, the measured maps exhibit Stokes/anti-Stokes polarization asymmetries and nontrivial patterns that stem from quadratic magneto-optical coupling terms. Fitting the data with a model including Voigt and Cotton-Mouton contributions yields an effective Cotton-Mouton constant and shows that the quadratic response is comparable to the linear Voigt contribution.

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Krzysztof Szulc, Mengying Guo, Ondřej Wojewoda, Hongyu Wang, Dominik Pavelka, Jan Klíma, Jakub Krčma, Xiufeng Han, Qi Wang, Michal Urbánek. 2026-02-17. Polarization-resolved measurement of forward volume spin waves by micro-focused Brillouin light scattering. https://arxiv.org/abs/2602.15760

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