Abstract

We develop a general coherent (pseudo)-mode representation of partially coherent surface plasmon polaritons in the Kretschmann excitation geometry. We obtain explicit analytical results for coherent pseudo-modes of narrowband SPPs with Gaussian spectra and spectral correlations. We also evaluate the global degree of coherence of such SPPs which quantifies their overall coherence state within a given spatial domain. Not only will the developed coherent pseudo-mode representation facilitate SPP coherence state characterization, but it will also substantially reduce the computational complexity of the studies of partially coherent SPP interactions with nanoparticles.

© 2018 Optical Society of America

Coherence lattices in surface plasmon polariton fields

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Plasmon coherence determination by nanoscattering

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