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Fig. 4 | eLight

Fig. 4

From: Floquet metamaterials

Fig. 4

Time-interfaces with temporal nonlocality arising from different microscopic dynamics, analogous to spatially nonlocal metamaterials. (a-b) Nonlocal metamaterials in the form of a multilayer, and b nanowires. c A time-interface between two temporally nonlocal (dispersive) media. The plasma frequency \(\omega_{p}\) is assumed to be switched from \(\omega_{p1}\) to \(\omega_{p2}\). The incident wave is denoted by the yellow wavepacket, while the four scattered waves, two forward and two backward, are drawn in different colors. d Dispersion diagram of a non-dispersive medium (yellow line) and the one of a medium with Lorentz-type dispersion (the other four curves). The dashed arrows illustrate the temporal scattering process. e and f show two different protocols of switching \(\omega_{p}\): the density of carriers is suddenly increased from \(N_{1}\) to \(N_{2}\) in e where the number of symbolic oscillators increases; the effective mass becomes heavier from \(m_{1}^{*}\) to \(m_{2}^{*}\) in f where the individual electron becomes smaller visually. The red curves show the temporal evolution of the electric field under two different switching schemes

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