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(a) Three-dimensional sketch of the waveguide architecture, the white color refers to the core while the gray region represents the cladding with either or . (b) Phase indices as a function of the normalized core thickness when , , , and . The solid gray line refers to the lossless case [ and ] while the top and bottom solid lines corresponds to the forward and the backward modes in the lossy case, respectively. A close up of the dashed curve around the zero group velocity point is plotted in the inset.
(a) Parameter space corresponding to a waveguide with the core filled with a material having relative permittivity . The shaded region represents the regime of slow light, in the lossless case. (b) Real parts of the retrieved effective permittivity and permeability corresponding to the SRR design shown in the inset of (c).
(a) Camera image of the sample. A single comb-shape stripe used to build the metamaterial cladding is shown in the inset I. A close up of split-ring copper pattern is shown in the inset II. Insets III and IV are, respectively, the close up on the transmitting antenna and the receiving antenna. (b) Schematic of the experimental setup. A PC controls a MTA connected to a SS. Channel A contains the sample, channel B is a coaxial cable used as a reference. The inset shows normalized pulse envelops detected by the MTA; the blue curve refers to the pulse passing through the reference channel A, while the red one is the signal delayed by the metamaterial waveguide.
(a) Transmission curve of the metamaterial slab measured inside a parallel plate waveguide under normal incidence. The green solid line refers to the frequency range considered in (b). Map of the measured group index as a function of the waveguide core thickness and the frequency . The color bar indicates the amplitude of . (c) Comparison between the experimental and the theoretical trend of as a function of at .
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