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. 2013 Apr 8;469(2152):20120533. doi: 10.1098/rspa.2012.0533

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© 2013 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 9. — Line defect, concentration and endoscope effects in square arrays of SRRs with two holes: (a) a line source at frequency Ω=0.6 located in the centre of a rectangular metamaterial consisting of 30 SRRs as in figure 5a produces a wave pattern of the line defect type; (b) a line source at frequency Ω=0.78 located in the centre of a rectangular metamaterial consisting of 33 SRRs shaped as in figure 5a produces a plane wave outside the array (omni-directive antenna via ultra-refraction); (c) a line source at frequency Ω=1.2 located above a rectangular metamaterial consisting of 33 SRRs shaped as in figure 5a leads to a concentration effect underneath; (d) zoom on dispersion diagram of figure 5a. Note that each cell in the arrays of SRRs in (b) and (c) is tilted by an angle π/4, unlike for (a).