Semianalytical model for the electromagnetic enhancement by a rectangular nanowire optical antenna on metallic substrate

Jianing Wan; Junda Zhu; Ying Zhong; Haitao Liu

doi:10.1364/JOSAA.35.000880

Journal of the Optical Society of America A
Vol. 35,
Issue 6,
pp. 880-889
(2018)
•https://doi.org/10.1364/JOSAA.35.000880

Semianalytical model for the electromagnetic enhancement by a rectangular nanowire optical antenna on metallic substrate

Jianing Wan, Junda Zhu, Ying Zhong, and Haitao Liu

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Jianing Wan, Junda Zhu, Ying Zhong, and Haitao Liu, "Semianalytical model for the electromagnetic enhancement by a rectangular nanowire optical antenna on metallic substrate," J. Opt. Soc. Am. A 35, 880-889 (2018)

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Abstract

The electromagnetic enhancement by a metallic nanowire optical antenna on metallic substrate is investigated theoretically. By considering the excitation and multiple scattering of surface plasmon polaritons in the nanogap between the antenna and the substrate, we build up an intuitive and comprehensive model that provides semianalytical expressions for the electromagnetic field in the nanogap to achieve an understanding of the mechanism of electromagnetic enhancement. Our results show that antennas with short lengths that support the lowest order of resonance can achieve a high electric-field enhancement factor over a large range of incidence angles. Two phase-matching conditions are derived from the model for predicting the antenna lengths at resonance. Excitation of symmetric or antisymmetric localized surface plasmon resonance is further explained with the model. The model also shows superior computational efficiency compared to the full-wave numerical method when scanning the antenna length, the incidence angle, or the wavelength.

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Equations (30)

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$h$	10 nm	20 nm	30 nm
$α^{+}$	$5.285 \exp (- 2.489 i)$	$3.279 \exp (0.720 i)$	$2.561 \exp (0.817 i)$
$α^{-}$	$4.856 \exp (0.973 i)$	$3.098 \exp (- 2.099 i)$	$2.418 \exp (- 2.035 i)$
$r$	$0.979 \exp (0.560 i)$	$0.975 \exp (0.660 i)$	$0.972 \exp (0.718 i)$
$n_{eff}$	$2.912 + 0.079 i$	$2.371 + 0.060 i$	$2.163 + 0.054 i$
$L$ ( $N = 1$ )	0.141 μm	0.167 μm	0.178 μm
$u r$	−0.913	−0.916	−0.915

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Journal of the Optical Society of America A