The Optimal Aspect Ratio of Gold Nanorods for Plasmonic Bio-sensing
The Optimal Aspect Ratio of Gold Nanorods for Plasmonic Bio-sensing
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DOI：
10.1007/s11468-010-9130-2
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发表时间：
2010-06-01
期刊：
影响因子：
3
通讯作者：
Soennichsen, Carsten
中科院分区：
文献类型：
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作者：
Becker, Jan;Truegler, Andreas;Soennichsen, Carsten
金属纳米颗粒的等离子体共振通过分析物的结合在周围介质的折射率变化时发生位移。该原理的使用允许构建可以检测分析物（例如，生物分子）的体积降至阿升。我们使用基于边界元方法的模拟来确定用于等离子体传感器的各种纵横比的金纳米棒的灵敏度，并发现3和4之间的值是最佳的。单粒子实验证实了这些理论结果。我们能够通过显示等离子体共振的品质因子的相应最大值来解释最佳值。
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.