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. 2016 Feb;472(2186):20150658. doi: 10.1098/rspa.2015.0658

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© 2016 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 9. — (a) Solutions of the eigenvalue problem for a system of five gratings with period $d_{y} = \sqrt{2}$ and separation d_x=1.0. (b) Close-up of the frequency window for Bloch mode frequencies; local maximum β=3.1375 and root β=3.151 are marked. (Online version in colour.)