Influence of polarization direction, incidence angle, and geometry on near-field enhancement in two-layered gold nanowires

doi:10.1088/1674-1056/21/7/077803

Abstract The influences of polarization direction, incidence angle, and geometry on the near-field enhancements in two-layered gold nanowires (TGNWs) have been investigated by using the vector wave function method. When the polarization direction is perpendicular to the incidence plane, the local field factor (LFF) in TGNW decreases first and then increases with the increase of the incidence angle. The minimum LFF is observed at the incidence angle of 41?. It is found that the increase of the dielectric constant of the inner core leads to the decrease of LFF. With the increase of the inner core radius, the LFF in TGNW increases first and then decreases, and the maximum LFF is observed at the inner core radius of 27 nm. On the other hand, when the polarization direction is parallel to the incidence plane, the collective motions of the induced electrons are enhanced gradually with the decrease of the incidence angle, and hence the near-field enhancement is increased.

Keywords: gold nanowire localized surface plasmon resonance near-field enhancement

Received: 29 January 2012
Revised: 29 February 2012
Accepted manuscript online:

PACS:	78.67.-n	(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
	78.67.Bf	(Nanocrystals, nanoparticles, and nanoclusters)
	36.40.Vz	(Optical properties of clusters)
	73.22.Lp	(Collective excitations)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2012CB921504), the National Natural Science Foundation of China (Grant Nos. 11174113, 10904052 and 11074124), and the PAPD of Jiangsu Higher Education Institutions, China.

Corresponding Authors: Liu Xiao-Jun
E-mail: liuxiaojun@nju.edu.cn

Cite this article:

Wu Da-Jian(吴大建), Jiang Shu-Min(蒋书敏), and Liu Xiao-Jun(刘晓峻) Influence of polarization direction, incidence angle, and geometry on near-field enhancement in two-layered gold nanowires 2012 Chin. Phys. B 21 077803

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Influence of polarization direction, incidence angle, and geometry on near-field enhancement in two-layered gold nanowires

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