Large single-molecule fluorescence enhancements produced by a bowtie nanoantenna

被引：1772

作者：

Kinkhabwala, Anika ^{[1
]}

Yu, Zongfu ^{[2
]}

Fan, Shanhui ^{[2
]}

Avlasevich, Yuri ^{[3
]}

Muellen, Klaus ^{[3
]}

Moerner, W. E. ^{[1
]}

机构：

[1] Stanford Univ, Dept Chem, Stanford, CA 94305 USA

[2] Stanford Univ, Dept Elect Engn, Stanford, CA 94305 USA

[3] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

来源：

NATURE PHOTONICS | 2009年 / 3卷 / 11期

基金：

美国国家科学基金会;

关键词：

PLASMONIC NANOANTENNAS; OPTICAL ANTENNAS; EFFICIENCY; EMISSION; PROBE; DECAY;

D O I：

10.1038/NPHOTON.2009.187

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Owing to the size mismatch between light and nanoscale objects such as single molecules, it is important to be able to control light-molecule interactions(1-4). Plasmonic nanoantennas create highly enhanced local fields when pumped resonantly, leading to increased Raman scattering(5), but whether fluorescence enhancement occurs depends upon a variety of factors. Although sharp metal tips(6) and colloids(7,8) can enhance fluorescence, the highly enhanced optical fields of lithographically fabricated bowtie nanoantennas(9) provide a structure that is more controllable and amenable to integration. Using gold bowties, we observe enhancements of a single molecule's fluorescence up to a factor of 1,340, ten times higher than reported previously(7,8,10-22). Electromagnetic simulations reveal that this is a result of greatly enhanced absorption and an increased radiative emission rate, leading to enhancement of the intrinsic quantum efficiency by an estimated factor of nine, despite additional non-radiative ohmic effects. Bowtie nanoantennas thus show great potential for high-contrast selection of single nanoemitters.

引用

页码：654 / 657

页数：4

共 30 条

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