Folded bands in metamaterial photonic crystals

P. Y. Chen, C. G. Poulton, A. A. Asatryan, M. J. Steel, L. C. Botten, C. Martijn De Sterke, R. C. McPhedran

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)
45 Downloads (Pure)


The dispersion relation of periodic structures that include metamaterials or materials with large anomalous dispersion can give bands with infinite group velocity points. These bands do not span the entire first Brillouin zone but are instead localized in k-space. We show that these points arise when both positive and negative elements are present, with the group index rather than the refractive index being the controlling quantity. A rigorous condition and two approximations are derived, each showing that an appropriate weighted average of group index being zero leads to infinite group velocity points.

Original languageEnglish
Article number053007
Pages (from-to)1-18
Number of pages18
JournalNew Journal of Physics
Publication statusPublished - May 2011

Bibliographical note

Copyright 2011 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.


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