Theory of the scattering of light and surface plasmon polaritons by finite-size subwavelength metallic defects via field decomposition

Details Theory of the scattering of light and surface plasmon polaritons by finite-size subwavelength metallic defects via field decomposition Theory of the scattering of light and surface plasmon polaritons by finite-size subwavelength metallic defects via field decomposition

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011njph...13g3045l&link_type=abstract

New Journal of Physics, Volume 13, Issue 7, pp. 073045 (2011).

Physics

Scientific paper

A theoretical model is presented for the scattering of light and surface plasmon polaritons (SPPs) by finite-size subwavelength metallic defects. Based on the decomposition of the scattered fields into SPPs and quasi-cylindrical waves (CWs), an SPP-CW model is developed to depict the multiple scattering of SPPs and CWs in finite-size defects using the elementary scattering processes in a single one. The involved elementary scattering of the CW, as well as the CW-related coefficients, which are difficult or even impossible to define and calculate according to classical scattering theory, is clarified. A close relationship between the scattering coefficients of the SPP and those of the CW has been pointed out and used to simplify the developed model. Compared to the corresponding pure SPP model and the fully vectorial computational data, the SPP-CW model is shown to be versatile and quantitatively accurate for finite-size defects such as grooves, ridges, slits or even hybrid systems of various geometrical parameters, over a broad spectral range from the visible to the thermal infrared regime.

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