Direct observation of negative-index microwave surface waves

Waves propagating in a negative-index material have wave-front propagation (wavevector, k ) opposite in direction to that of energy flow (Poynting vector, S ). Here we present an experimental realisation at microwave frequencies of an analogous surface wave phenomenon whereby a metasurface supports...

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Published inScientific reports Vol. 6; no. 1; p. 22018
Main Authors Dockrey, J. A., Horsley, S. A. R., Hooper, I. R., Sambles, J. R., Hibbins, A. P.
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 23.02.2016
Nature Publishing Group
Subjects
639/624/400/1102
639/766/119/544
Energy flow
Humanities and Social Sciences
multidisciplinary
Propagation
Science
Velocity
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Summary:Waves propagating in a negative-index material have wave-front propagation (wavevector, k ) opposite in direction to that of energy flow (Poynting vector, S ). Here we present an experimental realisation at microwave frequencies of an analogous surface wave phenomenon whereby a metasurface supports a surface mode that has two possible wavevector eigenstates within a narrow band of frequencies: one that supports surface waves with positive mode index and another that supports surface waves with negative mode index. Phase sensitive measurements of the near-field of surface waves across the metasurface show the contrasting spatial evolution of the two eigenstates, providing a unique opportunity to directly observe the negative-index phenomenon.
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ISSN:2045-2322
2045-2322
DOI:10.1038/srep22018