Fano Resonances in Plasmonic Nanoclusters: Geometrical and Chemical Tunability

被引：592

作者：

Lassiter, J. Britt ^{[1
,2
]}

Sobhani, Heidar ^{[2
]}

Fan, Jonathan A. ^{[5
]}

Kundu, Janardan ^{[2
,4
]}

Capasso, Federico ^{[5
]}

Nordlander, Peter ^{[1
,2
,3
]}

Halas, Naomi J. ^{[1
,2
,3
,4
]}

机构：

[1] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA

[2] Rice Univ, Lab Nanophoton, Houston, TX 77005 USA

[3] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA

[4] Rice Univ, Dept Chem, Houston, TX 77005 USA

[5] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA

来源：

NANO LETTERS | 2010年 / 10卷 / 08期

基金：

美国国家科学基金会;

关键词：

Plasmon; Fano resonance; nanocluster; coherent phenomena; localized surface plasmon resonance (LSPR); sensing figure of merit (FoM); NANOPARTICLE CLUSTERS; ARRAYS; LIGHT; POLARIZATION; NANOANTENNAS; NANOCAVITIES; DIPOLAR; METALS; MODES; SERS;

D O I：

10.1021/nl102108u

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Clusters of plasmonic nanoparticles and nanostructures support Fano resonances. Here we show that this spectral feature, produced by the interference between bright and dark modes of the nanoparticle cluster, is strongly dependent upon both geometry and local dielectric environment. This permits a highly sensitive tunability of the Fano dip in both wavelength and amplitude by varying cluster dimensions, geometry, and relative size of the individual nanocluster components. Plasmonic nanoclusters show an unprecedented sensitivity to dielectric environment with a local surface plasmon resonance figure of merit of 5.7. the highest yet reported for localized surface plasmon resonance sensing in a finite nanostructure.

引用

页码：3184 / 3189

页数：6

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