Manipulated localized surface plasmon resonances in silver nanoshells coated with a spherical anisotropic layer

doi:10.1088/1674-1056/21/12/127806

Abstract The influences of the anisotropy of outer spherically anisotropic (SA) layer on the far-field spectra and near-field enhancements of the silver nanoshells are investigated by using a modified Mie scattering theory. It is found that with the increase of the anisotropic value of the SA layer, the dipole resonance wavelength of the silver nanoshell first increases and then decreases, while the local field factor (LFF) reduces. With the decrease of SA layer thickness, the dipole wavelength of the silver nanoshell shows a distinct blue-shift. When the SA layer becomes very thin, the modulations of the anisotropy of SA layer on the plasmon resonance energy and the near-field enhancement are weakened. We further find that the smaller anisotropic value of the SA layer is helpful for obtaining the larger near-field enhancement in the Ag nanoshell. The geometric average of the dielectric components of SA layer has a stronger effect on the plasmon resonance energy of the silver nanoshell than on the near-field enhancement.

Keywords: Ag nanoshell spherically anisotropic Mie theory localized surface plasmon resonance

Received: 17 May 2012
Revised: 07 June 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. 10904052, 11174113, and 11104319), the Jiangsu Planned Projects for Postdoctoral Research Funds, China (Grant No. 1002075C), and the Senior Talent Foundation of Jiangsu University, China (Grant No. 09JDG073).

Corresponding Authors: Wu Da-Jian, Liu Xiao-Jun
E-mail: wudajian@ujs.edu.cn;liuxiaojun@nju.edu.cn

Cite this article:

Jiang Shu-Min (蒋书敏), Wu Da-Jian (吴大建), Cheng Ying (程营), Liu Xiao-Jun (刘晓峻) Manipulated localized surface plasmon resonances in silver nanoshells coated with a spherical anisotropic layer 2012 Chin. Phys. B 21 127806

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Manipulated localized surface plasmon resonances in silver nanoshells coated with a spherical anisotropic layer

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