Narrow Collective Plasmon Resonances in Nanostructure Arrays Observed at Normal Light Incidence for Simplified Sensing in Asymmetric Air and Water Environments
Narrow Collective Plasmon Resonances in Nanostructure Arrays Observed at Normal Light Incidence for Simplified Sensing in Asymmetric Air and Water Environments
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DOI：
10.1021/ph5002186
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发表时间：
2014-11-01
期刊：
影响因子：
7
通讯作者：
Grigorenko, Alexander N.
中科院分区：
文献类型：
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作者：
Thackray, Benjamin D.;Kravets, Vasyl G.;Grigorenko, Alexander N.
我们在玻璃衬底上制备了金等离子体纳米阵列，支持窄的集体(衍射耦合)共振，可以在不对称的空气或水环境中用正常入射光激发。我们测量了空气中高达19、水中高达45、甘油中高达85的正常入射共振的品质因数，并在水中的生物传感应用中登记了非常高的优值系数。耦合偶极子近似被用来评估最佳的共振条件，并定性地解释了共振的性质。我们的结果可能有助于开发更简单、更便宜的基于表面等离子体共振的气体和生物检测方法。
We fabricate gold plasmonic nanoarrays on a glass substrate supporting narrow collective (diffraction coupled) resonances that can be excited with normal incident light in an asymmetric air or water environment. We measure quality factors of normal incidence resonances up to 19 in air, 45 in water, and 85 in glycerol and register a very high figure of merit for biosensing applications in water. The coupled dipole approximation is used to evaluate the optimum resonance conditions and qualitatively explain the properties of the resonances. Our results could help to develop simpler and cheaper surface plasmon resonance based approaches to gas and biodetection.