Dispersion of strongly confined channel plasmon polariton modes

Vladimir A. Zenin; Valentyn S. Volkov; Zhanghua Han; Sergey I. Bozhevolnyi; Eloïsa Devaux; Thomas W. Ebbesen

doi:10.1364/JOSAB.28.001596

Journal of the Optical Society of America B
Vol. 28,
Issue 7,
pp. 1596-1602
(2011)
•https://doi.org/10.1364/JOSAB.28.001596

Dispersion of strongly confined channel plasmon polariton modes

Vladimir A. Zenin, Valentyn S. Volkov, Zhanghua Han, Sergey I. Bozhevolnyi, Eloïsa Devaux, and Thomas W. Ebbesen

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Vladimir A. Zenin, Valentyn S. Volkov, Zhanghua Han, Sergey I. Bozhevolnyi, Eloïsa Devaux, and Thomas W. Ebbesen, "Dispersion of strongly confined channel plasmon polariton modes," J. Opt. Soc. Am. B 28, 1596-1602 (2011)

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Abstract

We report on experimental (by use of scanning near-field optical microscopy) and theoretical investigations of strongly confined ( $\sim λ / 5$ ) channel plasmon polariton (CPP) modes propagating at telecom wavelengths ( $1425 - 1630 nm$ ) along V-grooves cut in a gold film. The main CPP characteristics (mode index, width, and propagation length) are determined directly from the experimental near-field images and compared to theoretical results obtained using an analytic description of CPP modes supported by (infinitely deep) V-grooves and finite-element simulations implemented in COMSOL.

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λ	$d_{pen} (\exp)$	$N_{eff} (\exp)$	$w_{FWHM} (\exp)$	$d_{cut} (\infty) / d_{cut} (FEM)$	$N_{eff} (\infty) / N_{eff} (FEM)$	$w_{m} (\infty) / w_{m} (FEM)$
$1425 nm$	$550 nm$	1.08	$170 nm$	$650 nm / 750 nm$	$1.064 / 1.045$	$288 nm / 250 nm$
$1480 nm$	$600 nm$	1.07	$190 nm$	$679 nm / 825 nm$	$1.059 / 1.040$	$310 nm / 273 nm$

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Journal of the Optical Society of America B