Microwave seminar | 30 April 2026

Spatial dispersion and nonreciprocity in metamaterials have been extensively studied, yet at the intersection of these phenomena there are unknown effects. In this report I discuss recent results of our research group, where we investigate one instance of nonreciprocal nonlocal response. It gives rise to backscattering suppression in the bulk, a long-sought feature in topological photonics, as well as nonreciprocal lensing – an effect when the same structure focuses light incident from one direction and defocuses light propagating in the opposite way. We predict this response in spin spirals and in specially designed metamaterials.

Main paper/arXiv, related to the seminar, and other references, up to 5

1. Vagin, D. and Gorlach, M.A., 2026. Nonreciprocal lensing and backscattering suppression via magneto-optical nonlocality. arXiv:2602.10038.
2. Asadchy, V.S., Díaz-Rubio, A. and Tretyakov, S.A., 2018. Bianisotropic metasurfaces: physics and applications. Nanophotonics, 7(6), pp.1069-1094.
3. Yang, Q., Wen, X., Li, Z., You, O. and Zhang, S., 2025. Gigantic Tellegen responses in metamaterials. Nature Communications, 16(1), p.151.
4. Kotova, L.V., Kats, V.N., Platonov, A.V., Kochereshko, V.P., André, R. and Golub, L.E., 2018. Magnetospatial dispersion of semiconductor quantum wells. Physical Review B, 97(12), p.125302.