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(a) The schematic representation of the GNRISC. (b) Zoom of the structure surrounded by the rectangular area with the dashed line in (a).
Band structure of two different lattice spacing of the GNRISC. Inset picture shows the equifrequency contours for 0.75 MHz at different lattice spacing.
Left panel: pressure field distribution of output wave in plane at 0.75 MHz (a) Experimental result. (b) Theoretical calculation. Right panel: normalized intensity distribution at focus plot along -axis (c) Experiment. (d) Theory. The dashed lines denote input source, the solid lines denote the results with perfect SC, and the dashed dotted lines denote the results with GNRISC.
(a) The focal position of the GNRISC vs frequency (the triangular and circle dots denote the experimental and theoretical results). (b) The focal position of the GNRISCs vs the decrease step of lattice spacing .
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