Localization of Near-Field Resonances in Bowtie Antennae: Influence of Adhesion Layers

被引：75

作者：

Jiao, Xiaojin ^{[1
]}

Goeckeritz, Jeremy ^{[1
]}

Blair, Steve ^{[1
]}

Oldham, Mark ^{[2
]}

机构：

[1] Univ Utah, Dept Elect & Comp Engn, Salt Lake City, UT 84112 USA

[2] Appl Biosyst Inc, Applera Corp, Foster City, CA 94404 USA

来源：

PLASMONICS | 2009年 / 4卷 / 01期

关键词：

Bowtie antennae; Surface plasmons; Adhesion layers; OPTICAL-PROPERTIES; PLASMON RESONANCES; NANOPARTICLE PAIRS; SINGLE; ENHANCEMENT; EFFICIENCY; DECAY;

D O I：

10.1007/s11468-008-9075-x

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The near-field resonances of gold bowtie antennae are numerically modeled. Besides the short-range surface plasmon polariton (SR-SPP) mode along the main axis of the structure, a coupled SPP mode is also found in the gap region (G-SPP). The influence of adhesion layers is considered, which depends on the refractive index and the absorption of the adhesion material and whether it is continuous or etched. A high refractive index causes the peak of the SR-SPP to red-shift. High absorption quenches the intensity of the SR-SPP. The magnitude of influence depends on the overlap of the adhesion layer with the SR-SPP and G-SPP modes. The near-field resonance of the SPP mode on the top surface is also considered. An etched metal adhesion layer changes the near-field localization in the gap and causes the enhancement peaks at different heights within the gap to red-shift from top to bottom. A simple optimization method for the near-field localization by the combination of different top and bottom layers is demonstrated.

引用

页码：37 / 50

页数：14

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