Universal scaling of local plasmons in chains of metal spheres

被引：28

作者：

Arnold, Matthew D. ^{[1
]}

Blaber, Martin G. ^{[1
]}

Ford, Michael J. ^{[1
]}

Harris, Nadine ^{[2
]}

机构：

[1] Univ Technol Sydney, Inst Nanoscale Technol, Dept Phys & Adv Mat, Broadway, Australia

[2] Northwestern Univ, Dept Chem, Evanston, IL USA

来源：

OPTICS EXPRESS | 2010年 / 18卷 / 07期

关键词：

NANOPARTICLE PAIRS; WAVE-GUIDES; DIPOLE; SCATTERING; ABSORPTION; DIMERS; RULER; LIGHT; LIMIT;

D O I：

10.1364/OE.18.007528

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The position, width, extinction, and electric field of localized plasmon modes in closely-coupled linear chains of small spheres are investigated. A dipole-like model is presented that separates the universal geometric factors from the specific metal permittivity. An electrostatic surface integral method is used to deduce universal parameters that are confirmed against results for different metals (bulk experimental Ag, Au, Al, K) calculated using retarded vector spherical harmonics and finite elements. The mode permittivity change decays to an asymptote with the number of particles in the chain, and changes dramatically from 1/f(3) to 1/f (1/2) as the gap fraction (ratio of gap between spheres to their diameter), f, gets smaller. Scattering increases significantly with closer coupling. The mode sharpness, strength and electric field for weakly retarded calculations are consistent with electrostatic predictions once the effect of radiative damping is accounted for. (C) 2010 Optical Society of America

引用

页码：7528 / 7542

页数：15

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