145552 20260217205600.0 doi 10.1038/s41467-024-52750-3 sideral 140385 ART-2024-140385 eng Álvarez-Cuervo, J. Unidirectional ray polaritons in twisted asymmetric stacks 2024 Access copy available to the general public Unrestricted The vast repository of van der Waals (vdW) materials supporting polaritons offers numerous possibilities to tailor electromagnetic waves at the nanoscale. The development of twistoptics—the modulation of the optical properties by twisting stacks of vdW materials—enables directional propagation of phonon polaritons (PhPs) along a single spatial direction, known as canalization. Here we demonstrate a complementary type of directional propagation of polaritons by reporting the visualization of unidirectional ray polaritons (URPs). They arise naturally in twisted hyperbolic stacks with very different thicknesses of their constituents, demonstrated for homostructures of -MoO3 and heterostructures of -MoO3 and -Ga2O3. Importantly, their ray-like propagation, characterized by large momenta and constant phase, is tunable by both the twist angle and the illumination frequency. Apart from their fundamental importance, our findings introduce twisted asymmetric stacks as efficient platforms for nanoscale directional polariton propagation, opening the door for applications in nanoimaging, (bio)-sensing, or polaritonic thermal management. info:eu-repo/grantAgreement/ES/DGA/E13-23R info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es 15.7 2024 MULTIDISCIPLINARY SCIENCES 10 / 136 = 0.074 2024 Q1 T1 4.761 2024 Biochemistry, Genetics and Molecular Biology (miscellaneous) 2024 Q1 Physics and Astronomy (miscellaneous) 2024 Q1 Chemistry (miscellaneous) 2024 Q1 23.4 2024 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Obst, M. Dixit, S. Carini, G. F. Tresguerres-Mata, A. I. Lanza, C. Terán-García, E. Álvarez-Pérez, G. Álvarez-Tomillo, L. F. Diaz-Granados, K. Kowalski, R. Senerath, A. S. Mueller, N. S. Herrer, L. (orcid)0000-0002-3576-5156 De Teresa, J. M. (orcid)0000-0001-9566-0738 Wasserroth, S. Klopf, J. M. Beechem, T. Wolf, M. Eng, L. M. Folland, T. G. Tarazaga Martín-Luengo, A. Martín-Sánchez, J. Kehr, S. C. Nikitin, A. Y. Caldwell, J. D. Alonso-González, P. Paarmann, A. 15 (2024), 9042 [10 pp.] Nature communications 2041-1723 3202287 http://zaguan.unizar.es/record/145552/files/texto_completo.pdf Versión publicada 2399217 http://zaguan.unizar.es/record/145552/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:145552 articulos driver 2026-02-17-20:44:16 ARTICLE