The Optimal Aspect Ratio of Gold Nanorods for Plasmonic Bio-sensing

被引：0
|
作者：
Jan Becker
Andreas Trügler
Arpad Jakab
Ulrich Hohenester
Carsten Sönnichsen
机构：
[1] University of Mainz,Institute of Physical Chemistry
[2] Karl-Franzens University Graz,Institute of Physics
来源：
Plasmonics | 2010年 / 5卷
关键词：
Plasmon; Sensors; Nanorods; BEM; Spectroscopy; Nanoparticles; Nanocrystals; Gold;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The plasmon resonance of metal nanoparticles shifts upon refractive index changes of the surrounding medium through the binding of analytes. The use of this principle allows one to build ultra-small plasmon sensors that can detect analytes (e.g., biomolecules) in volumes down to attoliters. We use simulations based on the boundary element method to determine the sensitivity of gold nanorods of various aspect ratios for plasmonic sensors and find values between 3 and 4 to be optimal. Experiments on single particles confirm these theoretical results. We are able to explain the optimum by showing a corresponding maximum for the quality factor of the plasmon resonance.
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页码：161 / 167
页数：6
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