Subwavelength localization and toroidal dipole moment of spoof surface plasmon polaritons

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We experimentally and theoretically demonstrate subwavelength scale localization of spoof surface plasmon polaritons at a point defect in a two-dimensional groove metal array. An analytical expression for dispersion relation of spoof surface plasmon polaritons substantiates the existence of a band gap where a defect mode can be introduced. A waveguide coupling method allows us to excite localized spoof surface plasmon polariton modes and measure their resonance frequencies. Numerical calculations confirm that localized modes can have a very small modal volume and a high Q factor both of which are essential in enhancing light-matter interactions. Interestingly, we find that the localized spoof surface plasmon polariton has a significant toroidal dipole moment, which is responsible for the high Q factor, as well as an electric quadrupole moment. In addition, the dispersion properties of spoof surface plasmon polaritons are analyzed using a modal expansion method and numerical calculations.
Publisher
AMER PHYSICAL SOC
Issue Date
2015-01
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW B, v.91, no.3

ISSN
2469-9950
DOI
10.1103/PhysRevB.91.035116
URI
http://hdl.handle.net/10203/195569
Appears in Collection
PH-Journal Papers(저널논문)
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