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Azimuthal dispersion and energy mode condensation of grating-coupled surface plasmon polaritons

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Azimuthal dispersion and energy mode condensation of grating-coupled surface plasmon polaritons

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dc.contributor.author Romanato, Filippo
dc.contributor.author Lee, Kwang Hong
dc.contributor.author Kang, Husen Kartasasmita
dc.contributor.author Wong, Chee Cheong
dc.contributor.author Zong, Yun
dc.contributor.author Wolfgang, Knoll
dc.date.accessioned 2010-03-12T03:51:38Z
dc.date.available 2010-03-12T03:51:38Z
dc.date.copyright 2008
dc.date.issued 2010-03-12T03:51:38Z
dc.identifier.citation Romanato, F., Lee, K. H., Kang, H. K., Wong, C. C., Zong, Y. & Wolfgang, K. (2008). Azimuthal dispersion and energy mode condensation of grating-coupled surface plasmon polaritons. Physical Review B: Condensed Matter and Materials Physics, (77), 245435, 1-7.
dc.identifier.issn 1098-0121
dc.identifier.uri http://hdl.handle.net/10220/6203
dc.description.abstract The excitation conditions for surface plasmon polaritons (SPPs) on a silver-gold bilayer coated sinusoidal grating can be varied over a wide range by tuning the azimuthal grating orientation (α). Grating coupling induces rotation of the SPP wave vector which, for specific conditions, can be directed perpendicular to the exciting light direction. Certain α orientations allow the excitation of two SPPs with the same frequency but different propagation directions. Other azimuthal orientations allow excitation of many SPP modes characterized by propagation over a large angular range. The kinematics of SPP propagation can be described by a model based on the wave-vector conservation law. Using this model, SPP dispersion relation, propagation direction, and mode density have been computed and shown to be in agreement with experimental measurements. The wave-vector dispersion is characterized by an energy threshold for the SPP excitation that increases as α increases. The angular spread is accompanied by an energy condensation of the SPP modes in correspondence to the energy threshold.
dc.format.extent 7 p.
dc.language.iso en
dc.relation.ispartofseries Physical review B : condensed matter and materials physics
dc.subject DRNTU::Engineering::Materials::Plasma treatment.
dc.title Azimuthal dispersion and energy mode condensation of grating-coupled surface plasmon polaritons
dc.type Journal Article
dc.contributor.school School of Materials Science and Engineering
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevB.77.245435
dc.description.version Accepted version
dc.identifier.rims 134413

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