Fano Profiles Induced by Near-Field Coupling in Heterogeneous Dimers of Gold and Silver Nanoparticles

被引：207

作者：

Bachelier, G. ^{[1
]}

Russier-Antoine, I. ^{[1
]}

Benichou, E. ^{[1
]}

Jonin, C. ^{[1
]}

Del Fatti, N. ^{[1
]}

Vallee, F. ^{[1
]}

Brevet, P. -F. ^{[1
]}

机构：

[1] Univ Lyon 1, CNRS, UMR 5579, Spectrometrie Ion & Mol Lab, F-69622 Villeurbanne, France

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.101.197401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The near-field coupling between a gold and a silver spherical nanoparticle is investigated theoretically. Fano profiles are observed in the absorption cross section of the gold nanoparticle due to the coupling between the spectrally localized surface plasmon resonance of the silver nanoparticle and the continuum of interband transitions of the gold one. The effect of dimer internal characteristics (particle sizes and distance), surrounding medium (through the refractive index), and external excitation (polarization and propagation directions) are addressed. In particular, it is shown that the near-field coupling can be tuned from the weak to the strong regime by rotating the polarization direction, and that the Fano profiles are sensitive to the shadowing effect even for small particle sizes.

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页数：4

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