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A fundamental relation between phase and group velocity, and application to the failure of perfectly matched layers in backward-wave structures

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dc.contributor.author Loh, Po-Ru
dc.contributor.author Skorobogatiy, Maksim
dc.contributor.author Oskooi, Ardavan
dc.contributor.author Johnson, Steven
dc.date.accessioned 2009-06-15T17:42:38Z
dc.date.available 2009-06-15T17:42:38Z
dc.date.issued 2009-06-11
dc.identifier.uri http://link.aps.org/doi/10.1103/PhysRevE.79.065601
dc.identifier.uri http://hdl.handle.net/1721.1/45564
dc.description http://link.aps.org/doi/10.1103/PhysRevE.79.065601 en
dc.description.abstract We demonstrate that the ratio of group to phase velocity has a simple relationship to the orientation of the electromagnetic field. In nondispersive materials, opposite group and phase velocity corresponds to fields that are mostly oriented in the propagation direction. More generally, this relationship (including the case of dispersive and negative-index materials) offers a perspective on the phenomena of backward waves and left-handed media. As an application of this relationship, we demonstrate and explain an irrecoverable failure of perfectly matched layer absorbing boundaries in computer simulations for constant cross-section waveguides with backward-wave modes and suggest an alternative in the form of adiabatic isotropic absorbers. en
dc.language.iso en_US en
dc.publisher American Physical Society en
dc.title A fundamental relation between phase and group velocity, and application to the failure of perfectly matched layers in backward-wave structures en
dc.type Article en
dc.identifier.citation Phys. Rev. E , Volume 79, Issue 6 en


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