Near-field numerical analysis of surface plasmon polariton propagation on metallic gratings

Gianluca Ruffato (Department of Physics and Astronomy “G. Galilei”, University of Padova, Padova, Italy Laboratory for Nanofabrication of Nanodevices, Veneto Nanotech, Padova, Italy and CNR-INFM TASC IOM National Laboratory, Trieste, Italy)
Filippo Romanato (Department of Physics and Astronomy “G. Galilei”, University of Padova, Padova, Italy Laboratory for Nanofabrication of Nanodevices, Veneto Nanotech, Padova, Italy CNR-INFM TASC IOM National Laboratory, Trieste, Italy)

Abstract

Purpose

The purpose of this paper is to simulate and analyze the excitation and propagation of surface plasmon polaritons (SPPs) on sinusoidal metallic gratings in conical mounting.

Design/methodology/approach

Chandezon's method has been implemented in MATLAB environment in order to compute the optical response of metallic gratings illuminated under azimuthal rotation. The code allows describing the full optical features both in far- and near-field terms, and the performed analyses highlight the fundamental role of incident polarization on SPP excitation in the conical configuration.

Findings

Results of far-field polarization conversion and plasmonic near-field computation clearly show that azimuthally rotated metallic gratings can support propagating surface plasmon with generic polarization.

Originality/value

The recent papers experimentally demonstrated the benefits in sensitivity and the polarization phenomenology that are originated by an azimuthal rotation of the grating. In this work, numerical simulations confirm these experimental results and complete the analysis with a study of the excited SPP near-field on the metal surface.

Keywords

Acknowledgements

The authors gratefully acknowledge support from the University of Padova through the PLATFORMS strategic project “PLAsmonic nano-Textured materials and architectures FOR enhanced Molecular Sensing” and the support from CARIPARO foundation through the project SPLENDID “Surface PLasmonics for Enhanced Nano Detectors and Innovative Devices”.

Citation

Ruffato, G. and Romanato, F. (2013), "Near-field numerical analysis of surface plasmon polariton propagation on metallic gratings", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 32 No. 6, pp. 1779-1792. https://doi.org/10.1108/COMPEL-10-2012-0269

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Publisher

:

Emerald Group Publishing Limited

Copyright © 2013, Emerald Group Publishing Limited

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