Ortega Gómez, ÁngelLobet, MichaëlVázquez Lozano, Juan EnriqueLiberal Olleta, Íñigo2023-10-202023-10-202023Ortega-Gomez, A., Lobet, M., Vázquez-Lozano, J. E., & Liberal, I. (2023). Tutorial on the conservation of momentum in photonic time-varying media [Invited]. Optical Materials Express, 13(6), 1598. https://doi.org/10.1364/OME.4855402159-393010.1364/OME.485540https://academica-e.unavarra.es/handle/2454/46600Time-varying media break temporal symmetries while preserving spatial symmetries intact. Thus, it represents an excellent conceptual framework to investigate the fundamental implications of Noether’s theorem for the electromagnetic field. At the same time, addressing momentum conservation in time-varying media sheds light on the Abraham-Minkowski debate, where two opposing forms of the electromagnetic field momentum are defended. Here, we present a tutorial review on the conservation of momentum in time-varying media. We demonstrate that the Minkowski momentum is a conserved quantity with three independent approaches of increasing complexity: (i) via the application of the boundary conditions for Maxwell equations at a temporal boundary, (ii) testing for constants of motion and deriving conservation laws, and (iii) applying temporal and spatial translations within the framework of the Lagrangian theory of the electromagnetic field. Each approach provides a different and complementary insight into the problem.application/pdfeng© 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.Momentum conservationTime varying-mediainfo:eu-repo/semantics/article2023-10-20info:eu-repo/semantics/openAccess