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• W2971105369 abstract "Here we re-examine one of the most basic quantities in optics: the refractive index. Considering propagation in a plane, we first develop a general formalism for calculating the direction dependent refractive index in a general bi-anisotropic material. From this we derive the general condition for achieving zero refractive index in a given direction. We show that when the zero-index direction is complex valued the material supports waves that can propagate in only one sense, e.g. in only a clockwise direction. We dub such materials complex axis nihility (CAN) media. Our condition shows that there are an infinite family of both time reversible and time irreversible homogeneous electromagnetic media that support unidirectional propagation for a particular polarization. We give examples showing that scattering from such media results in the complete exclusion of partial waves with one sign of the angular momentum, and that interfaces between such media generally support one-way interface states. As well as giving new sets of material parameters, our simple condition reproduces many of the findings derived using topology, such as unidirectional propagation in gyrotropic media, and spin-momentum locking of evanescent waves." @default.
• W2971105369 created "2019-09-05" @default.
• W2971105369 creator A5019414908 @default.
• W2971105369 creator A5078625839 @default.
• W2971105369 date "2019-08-30" @default.
• W2971105369 modified "2023-09-24" @default.
• W2971105369 title "Zero index electromagnetic materials" @default.
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• W2971105369 doi "https://doi.org/10.48550/arxiv.1908.11844" @default.
• W2971105369 hasPublicationYear "2019" @default.
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