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Experimental samples: a periodic (a) and a spatially random (c) wire medium. (b)-(d) Measure of the hybridization bandgap of both samples. (e) Schemed top view of the samples under study, showing the spatial distribution of wires. Point defect in the hybridization bandgap for the periodic (left) and spatially random (right) sample. This point defect consists in introducing a shorter wire with a resonant frequency f′ within the bandgap of the metamaterial.
(a) Measure of S 11 in the near field of the wire medium with or without the point defect in the periodic (left) and spatially random (right) sample. (b) Experimental measure of the confinement around the point defect in the periodic (left) and spatially random (center and right) samples.
Profile of the in logarithmic scale for two defect frequencies in the periodic array (a) and two positions in the random array (b). In inset are shown the corresponding linear profiles.
(a) Sketch of the theoretical investigation of the shrunken cavities. Evolution of (b) the Q factor (blue) and mode volume Vm (red), and (c) the Purcell factor when reducing the lattice parameter a (and consequently the wire's radius).
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