Geometrical optimization of nanostrips for surface plasmon excitation: an analytical approach

Thomas Grosges; Dominique Barchiesi

doi:10.1364/OL.43.000054

Optics Letters
Vol. 43,
Issue 1,
pp. 54-57
(2018)
•https://doi.org/10.1364/OL.43.000054

Geometrical optimization of nanostrips for surface plasmon excitation: an analytical approach

Thomas Grosges and Dominique Barchiesi

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Thomas Grosges and Dominique Barchiesi, "Geometrical optimization of nanostrips for surface plasmon excitation: an analytical approach," Opt. Lett. 43, 54-57 (2018)

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Table of Contents Category
- Optics at Surfaces
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About this Article
History
- Original Manuscript: October 24, 2017
- Revised Manuscript: November 22, 2017
- Manuscript Accepted: November 23, 2017
- Published: December 21, 2017

Abstract

We give a simple tool for the optimization of the dimensions of a metallic nanostrip illuminated at a given wavelength under normal incidence, to get a maximum of the electromagnetic field amplitude in the nanostrip. We propose an analytical formula that gives the widths and heights of the series of nanostrips that produce field enhancement. The validity of the analytical formula is checked by using the finite element method. This design of a nanostrip could be useful for sensors and thermally active components.

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	Relative Permittivity $ε_{r}$	Optical Index $n$
Glass	2.25	1.5
Air	1.00	1.0
Au	$- 10.916 + j 1.324$	$0.200 + j 3.310$

Material	$λ_{0}$	$ε_{r}$	$λ_{spp} (h)$	$w_{0} (h)$
Au	632.0	$- 10.92 + j 1.32$	343.4	114.5
Ag	632.0	$- 18.00 + j 0.47$	382.6	127.5
Au	532.0	$- 5.54 + j 2.25$	249.8	83.3
Ag	532.0	$- 10.18 + j 0.82$	292.9	97.6

	Relative Permittivity $ε_{r}$	Optical Index $n$
Glass	2.25	1.5
Air	1.00	1.0
Au	$- 10.916 + j 1.324$	$0.200 + j 3.310$

Material	$λ_{0}$	$ε_{r}$	$λ_{spp} (h)$	$w_{0} (h)$
Au	632.0	$- 10.92 + j 1.32$	343.4	114.5
Ag	632.0	$- 18.00 + j 0.47$	382.6	127.5
Au	532.0	$- 5.54 + j 2.25$	249.8	83.3
Ag	532.0	$- 10.18 + j 0.82$	292.9	97.6

Abstract

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Optics Letters